Hey,
I've been thru this before, so I can relate. Honestly, there is no easy way to get out of depression, and even now, I still struggle with it. I'd recommend seeing a counselor at least once, NOT because she is going to give you any advice you don't already know, but because it'll be nice to complain honestly and talk exclusively about yourself and all your problems to a person. And I find that once you get everything out, you'll find that your problems were not so major after all. It seems like you are suffering from mild depression, nothing to panic about. I agree though, that depression can be distracting as hell. Join some clubs where you get to interact with people, and esp. kids--i.e. tutoring, community service, orchestra, sports. Stay away from activities where you know there'll be super-competitive or superficial annoyingly chippery people. I know that when you're depressed, you don't feel like doing any of the above, but you have to force yourself to do it. Then, you'll feel much better about it afterward.
Whenever you feel lonely, go out and spend time with friends. There have been instances when I just showed up on my friend's doorstep b/c I was feeling so down I couldn't stand to be by myself anymore. They'll understand. If you don't have friends close enough to do this, then it's even more important for you to join activities to make you as busy as possible. Also, it's really important to exercise. Even if you don't like running, at least go out for nice long walks.
I hope this helps. One more thing. I don't know if you're religious, but some Christian groups on campus can be extremely nurturing. Many of them offer "personal hours" where you can meet with someone for an hour to go over the Bible (or talk about what you're struggling with, etc.)
FINAL NOTE: When you're depressed, your room is BAD. Especially if you live in a single. BAD BAD BAD. You will just end up wallowing in self-pity. Even if you need to study, GO OUTSIDE to a library, campus center, ANYWHERE except your room.
I really hope you get better. I've been in your position, and I know how awful it feels. If you have any more questions, feel free to PM me 🙂