Having something to offer helps a lot. Especially in college where people don't have much. Do you have a car so you can give people rides? Know any good places to go, or some party games?
I knew a guy who was invited everywhere and got tons of tail because he had great drug connections. Major asshole, but people wanted him around.
I learned how to mix drinks and brought a new concoction to parties I went to. It went over great.
People are pretty simple and like to get thier needs met. Your meet thiers, and they'll help you meet yours.
Not everyone can be Van Wilder and win everyone over with thier personality. You need to find your gimmick.
Watch out, though, with the "having something to offer" part. In other words, dont lean too heavily on what you have to offer someone after the first few interactions. Use it in the beginning to establish a friendship with someone, and after the first few interactions you should let your natural personality shine and start hanging out with someone on the basis of mutual friendship. You dont wanna be that guy that people just use for something. Its definitely a good way of starting up an initial friendship, especially in a situation like yours. But just dont overdo it, because if you do then people will only start to talk to you/befriend you in order to get that which you offer.