Here's how to turn negative thoughts into positive, but realistic thoughts:
* I just don't know what to do, which direction to go in my life.
-> i'm not sure what i want to do with my life yet, so i'm going to go out and try a bunch of different things until i do know what i want to do.
*I've studied economics, finance and accountancy, but I've forgotten a lot
-> i have a good, useful degree, so i always have that to fall back on if i need a job. I just need to brush up on some stuff i can't remember right now.
*I wanted to be an astronomist / cosmologist, but I'm not good enough in maths / physics
-> i wanted to be an astronomist, but i haven't learned maths and physics well enough yet. So, i'm going to start off learning these right from the basics, and make sure i have those solidly down. Then i can pursue this in the future.
*I'm also interested in IT, with which I might actually be able to make a living, but right now I'm at home with my parents...
-> I'm interested in IT too though, so if astronomy doesn't work out it's no big deal. I'll research what skills i'll need to get an IT job, then start applying. Luckily, I'm at home with my parents right now, so I have all the time I need to do that kind of research.
* I have to come up with a plan and real soon, because I have to move.
-> I'm really lucky to have parents who care about me and want me to be happy, and give me the time I need to decide what I want to do in the world. But I also want to live independantly, so i'll do my research as quickly as I can.
*Being a physicist is too far fetched (I'm 27 already) besides I don't want to study full-time again - it just doesn't feel right (and I also cannot afford it).
-> I know i can achieve whatever I want to, but I have to be prepared to work hard for it. Right now my priority is to get a job though, so i'll continue studying those things I love in my spare time. That way, I can get to the level I need to be at, while saving some money. Being able to afford study can be difficult, but i'll just have to try my best to get a scholarship. If I can't get one now, I'll find out what would improve my chances and try again later. etc.
*I'm attracted to big cities, and big things in general (macroeconomics, cosmology, ect) but also interested in programming. But I feel lost.
-> i have a general idea of where my interests lie, and it's quite a wide area, so there's probably tons of jobs i'd be interested in! I'll have to try more things in real life before I can really decide.
* I just feel it doesn't matter what I choose it WILL be the wrong decision, so I'm afraid to chose, to move out...
-> it doesn't really matter what I do, or what happens, as long as I try my best, try to make the most out of every opportunity and learn from things that go wrong, or that i end up not enjoying.
* in my past all my decisions since the university were mistakes....basically all of them. No, come to think of it since choosing what to stuy, all my choices were mistakes.
-> well, i haven't been too happy with some of my previous decisions, but there's no real point in regretting the past, because everyone can only make decisions based on the information they have at the time. Anyway, I always learn from whatever i do in the world, good or bad, so it's no big deal.
* i'm such a loser, i missed an opportunity to cheat today.
-> hey, cool, i'm not some scummy mf who wants to win by cheating. If that's what they expected of me, that company is clearly going to suck to work for anyway, so, whatever. Other, better opportunities'll come along.
*Hahahahaaha riiiiight. I've been bouncing my head into the wall for the last 20 minutes, pretty sure the bitch has to do something with me getting to psychiatria. Seems like I have some god damned emotional turmoil, when I saw her relationship status, my heart was bouncing.
-> damn, the girl i liked is in love with someone else. I feel a bit rubbish right now. But i spent a lot of time with her, and liked her a lot, so it's pretty normal that i don't feel so good about it. Just gotta ride it out. It's not her fault, really.
* Seems like I have a bad habit of not being able to get over things. How do you do that? Yes I can forget, but sometimes it reoccurs, just for a second / minute, and then fades away.
-> This hurts a bit cos i really liked her. That's actually normal though. Just gotta ride it out.
* Damn, I'm sorting my files and I came over an email (saved in doc format) I sent to that.....person. Damn....If only I could go back one year before....if only......just one year....
-> ah man, sorting my files and reading stuff i sent her a year ago probably isn't going to help right now. I'm gonna go outside and take a walk for a bit. Ah well, there's no point in regretting the past. Sometimes things just don't work out, and people you fall in love with don't love you back. It hurts, but it's the way it is. I'll probably find someone who i get on better with and who really loves me in the future sometime.
etcetcetc.
Do you see? It IS possible. Every negative thought you have, you need to think about it, try to put it in some perspective, and then you can learn to think about it differently.
* I just don't know what to do, which direction to go in my life.
-> i'm not sure what i want to do with my life yet, so i'm going to go out and try a bunch of different things until i do know what i want to do.
*I've studied economics, finance and accountancy, but I've forgotten a lot
-> i have a good, useful degree, so i always have that to fall back on if i need a job. I just need to brush up on some stuff i can't remember right now.
*I wanted to be an astronomist / cosmologist, but I'm not good enough in maths / physics
-> i wanted to be an astronomist, but i haven't learned maths and physics well enough yet. So, i'm going to start off learning these right from the basics, and make sure i have those solidly down. Then i can pursue this in the future.
*I'm also interested in IT, with which I might actually be able to make a living, but right now I'm at home with my parents...
-> I'm interested in IT too though, so if astronomy doesn't work out it's no big deal. I'll research what skills i'll need to get an IT job, then start applying. Luckily, I'm at home with my parents right now, so I have all the time I need to do that kind of research.
* I have to come up with a plan and real soon, because I have to move.
-> I'm really lucky to have parents who care about me and want me to be happy, and give me the time I need to decide what I want to do in the world. But I also want to live independantly, so i'll do my research as quickly as I can.
*Being a physicist is too far fetched (I'm 27 already) besides I don't want to study full-time again - it just doesn't feel right (and I also cannot afford it).
-> I know i can achieve whatever I want to, but I have to be prepared to work hard for it. Right now my priority is to get a job though, so i'll continue studying those things I love in my spare time. That way, I can get to the level I need to be at, while saving some money. Being able to afford study can be difficult, but i'll just have to try my best to get a scholarship. If I can't get one now, I'll find out what would improve my chances and try again later. etc.
*I'm attracted to big cities, and big things in general (macroeconomics, cosmology, ect) but also interested in programming. But I feel lost.
-> i have a general idea of where my interests lie, and it's quite a wide area, so there's probably tons of jobs i'd be interested in! I'll have to try more things in real life before I can really decide.
* I just feel it doesn't matter what I choose it WILL be the wrong decision, so I'm afraid to chose, to move out...
-> it doesn't really matter what I do, or what happens, as long as I try my best, try to make the most out of every opportunity and learn from things that go wrong, or that i end up not enjoying.
* in my past all my decisions since the university were mistakes....basically all of them. No, come to think of it since choosing what to stuy, all my choices were mistakes.
-> well, i haven't been too happy with some of my previous decisions, but there's no real point in regretting the past, because everyone can only make decisions based on the information they have at the time. Anyway, I always learn from whatever i do in the world, good or bad, so it's no big deal.
* i'm such a loser, i missed an opportunity to cheat today.
-> hey, cool, i'm not some scummy mf who wants to win by cheating. If that's what they expected of me, that company is clearly going to suck to work for anyway, so, whatever. Other, better opportunities'll come along.
*Hahahahaaha riiiiight. I've been bouncing my head into the wall for the last 20 minutes, pretty sure the bitch has to do something with me getting to psychiatria. Seems like I have some god damned emotional turmoil, when I saw her relationship status, my heart was bouncing.
-> damn, the girl i liked is in love with someone else. I feel a bit rubbish right now. But i spent a lot of time with her, and liked her a lot, so it's pretty normal that i don't feel so good about it. Just gotta ride it out. It's not her fault, really.
* Seems like I have a bad habit of not being able to get over things. How do you do that? Yes I can forget, but sometimes it reoccurs, just for a second / minute, and then fades away.
-> This hurts a bit cos i really liked her. That's actually normal though. Just gotta ride it out.
* Damn, I'm sorting my files and I came over an email (saved in doc format) I sent to that.....person. Damn....If only I could go back one year before....if only......just one year....
-> ah man, sorting my files and reading stuff i sent her a year ago probably isn't going to help right now. I'm gonna go outside and take a walk for a bit. Ah well, there's no point in regretting the past. Sometimes things just don't work out, and people you fall in love with don't love you back. It hurts, but it's the way it is. I'll probably find someone who i get on better with and who really loves me in the future sometime.
etcetcetc.
Do you see? It IS possible. Every negative thought you have, you need to think about it, try to put it in some perspective, and then you can learn to think about it differently.

Ok, ok, so I was probably in a one-sided love, I just don't want to admit it....or rather can't believe it, well that's life.
What does the new job entail? Programming?