Brutalis,
You can take this and tell me to off, or appreciate the insights of someone who's been there. At 20, you don't need a girlfriend. You need to be bending over every co-ed you can get your hands on, becuase the older you get, the more difficult casual sex is to obtain.
Right now, you can go to house parties, Padre, etc and find women just looking to hook up. In a few years, you'll be buying expensive dinners and stupendous bar tabs trying to get laid. And they won't look as good then as they do now. Live it up while you can, and worry about finding that special someone when you're ready to settle down.
Of course, if you're looking to settle down now, best of luck putting this past you.