I just feel like a loser because girls just won't date me and run off with jocks?

I don't know if you'll see this as an obvious answer but; you are only 18, there will be many more girls who will see you for who you are, a loyal polite guy who knows how to treat a girl! College is a big place to discover even more people, girls shouldn't like you for your looks, they should like you for who you are!