It's difficult to say that college is full of 'betas', with few alphas. In reality, I'm pretty sure there's a spectrum of beta-tude. The true betas are rare, just are the true alphas.
I know many guys who are beta in certain ways (terrible body language, dress poorly), but are dominantly alpha in others (purse their interests with blazing passion, great general social skills - if women aren't turned off by his appearance) and a few of them have a girlfriend whom they've been dating for a while.
I've realized that you don't have to be perfect to get the girl...in some cases, you don't even have to approach, just talk to people you regularly come into contact with or bump into everyday over time. Out of all those people, a girl will probably like you (Mere presence effect, Propinquity: relevant psychology terms).