I have no friends in college. I'd always cry in my dorm room. I don't want to go back to college cause it makes me feel depressed. I also am scared of the future. I don't know what to do after college. That stressed me out
OK I've seen your edit, got it.
I'll share a personal story:
When I was 16-21 ish, I was so socially withdrawn (and so into my studies, especially maths) that it was suggested by my college that I may have Asperger's (a high functioning form of autism).
As it happens, after my first suicide attempt at university for precisely the social reasons you describe, I came out of my shell to such an extent that when I took time out of university I was quite popular among my colleagues and others. I was the complete opposite: outgoing, social, less inhibited to a degree, able to read subtle social cues as if it was second nature, etc.
Maybe bipolar had something to do with going from very low to quite 'high', but what I'm saying is that being shy is not something that is built into you. You can overcome it.
By the way I will add this: university is a very social time. I look back now and wonder what I gained from the nights out. Nothing!
OK I only had the occasional night out or social drink, not like others. But if you're feeling low because you're not out every night clubbing, then don't judge yourself against what everybody else is doing.
Also: you will find that you fit in better with people who are a few years older than you. People who have got past the 'clubbing every night' phase (if they ever had it). Essentially, you may already be behaving in a way that is more mature, in some ways.
I know I haven't gone into much detail, and I know I haven't worded things perfectly there.