Well, I'm a lot older than you but when I was 21, I wasn't into that scene either. I never liked to drink so that was a literal buzz kill. It made the whole club-thing seem ridiculous.
If you want to try something different, I suggest you learn how to dance something like salsa, or swing. It's A LOT of fun to go out when you have something to do-- dance. When the focus is on dancing and not getting trashed, it attracts a different type of people. The other good thing is you can take lessons to improve, go to dances or clubs geared toward a specific dance style, go to weekend workshops, and meet all kinds of people.
Otherwise, if not dancing, try another social hobby. Anything that doesn't focus on alcohol is a lot more fun.