[mathattack]

There is surface advice, which addresses the high level problem at hand. You got into an ivy league - make the most of it. Learn CS, math, philosophy and whatever else interests you.

Then there is the root problem, which is depression. There is no rational advice about "suck it up and go back to school" that will help here. Your problem is uniquely yours, but you are not the only one to feel it. It is a chemicals in the brain problem, not a willpower issue. Depression hits smart people more than dumb people. (Shouldn't it be the other way around?) If you can't go to your parents, do be aware that most Ivy League caliber schools do have strong support networks if you look around.

If you want to talk, create and post a dummy email address and I'll shoot you my contact info.