How can I meet a good guy?

I want to meet someone who's serious about a relationship. I'm 20, I've never really had a boyfriend. How can I find someone who wants to be with me? I mean I don't think I'm hideous or anything. I'm 5'8" and I weigh about 185 lbs, though I'm currently on a diet. (My goal weight is 130). Is there anything I can do to help me find someone?