College is easy
You're creating excuses to not go out and pick up girls. You are creating your own limitations, STOP doing this as soon as you can. Instead, ask yourself "How do I get where I want to be?"
Frat parties limited to just frat guys getting the girl, WTF?? I don't know about the US but this isn't usually the case over here. If you have some friends there, just go with them and start meeting more and more people when you're there.
Classroom is indeed just for studying, but don't you ever have a lunch at college or get eyecontact with girls in your class so you can start a conversation with her afterwards?
As for appartment parties, just walk in and start getting to know people, they're having a party, if you know how to have fun they usually love to have you there!
Instead of thinking that it's really hard, realize that it's just as hard as anywhere else. It never gets any easier than college, actually.