How do I make good friends?

Seems like a ridiculous question if I say so myself, but in all honesty I can not seem to make friends in college. I have wonderful friends, they’re just at other colleges or back home. I’ve been at the same college for 2years and I should have least one good friend by now.

I have a couple theories as to why I’m not making friends.
1-I’m a non-drinker and going to one of the top drinking schools in the country does not help. I don’t trust people when alcohol is involved. (The next question I usually get is “Are you religious?” and the answer is no. More than anything I’m and introvert and drinking just doesn’t appeal to me.)
2— As was just mentioned, I’m introvert. This means I’m generally a quiet person who likes keeping a low profile. However I’m a strange breed of person because I’m also outgoing, which means I’m very sociable and love talking to people. But I can only talk to one or two people at a time. I’m not sure why. =/ I suppose I get nervous in large groups and don’t feel that I can be my true self.
3— I’m too busy. I’m a full time student who is also holding two jobs. One day job and a night shift at a local restaurant. (Tiring, I know T_T)

So what do I do? I’m lonely here. It makes me sad that I have no one to talk to or hang out with. How do I find the good people here and make a decent friend?