Life is not easy. It seems sometimes like most people don't realize how much SKILL it takes to be good at it. It sounds like you're just getting a pretty heavy dose of it (life) at this point = things are hard right now.

Not long from now you'll have grown and learned from this - you'll be better at life because of it.

Here's a trick I figured out the other day after I had just spent an assload of effort observing Samuel L. Jackson's character in Pulp Fiction. If you haven't seen the movie, basically this character is the epitome of self-confidence. But that's almost besides the point, really. What I'm trying to suggest is that you might do like Samuel L. in Pulp Fiction and 'manually' put yourself into a different mindset - give a different perspective a try. You say you're 20 and in college. Same here. The thing I love about college is that you could re-invent yourself on almost a daily basis and no one would give a fuck, even if you act a bit wacky, or even pretentious or something. That's a cold way of putting it... but what I mean is that you're free to be whoever you want to be to the world.

college affords you the chance to escape most, if not all, of the scathing that a life-change like this might elicit from people you're more intimate with - ie. family and 'old buddies.' But there's nothing wrong with bouncing around.

But here's the trick, finally. It's simple but I think surprisingly effective at putting yourself into a different, more confident mindset.
DON'T LET YOUR EYES LEAVE THE HORIZON LINE. Simple. This sounds weird, but don't knock it till you've done it. Don't avoid eye contact, but don't shy away from it either. And whatever you do, resist all urges to look downward or above this line. There's a natural magic about that damned line, man. I don't know what it is... I'm still pretty baked and I just came to this conclusion about an hour ago, but I gave it a try (because I'm a naturally very shy person) on a long walk around a crowded area, and it does something to you.

Again, it might not do anything, but it definitely won't hurt. Give it a try, man. See what you think.