If it makes you feel better, I think dating is so much about luck it's not so much a reflection of YOU , as of the luck you've had if you are in a relationship. I never had a boyfriend until mid-college. I have a friend who has NEVER been in a relationship and is older than me - she is a lovely/attractive woman, and friendly... but has spent her attention on her schooling. Now she is looking around for a boyfriend. I think it seems harder by the end of college (I'm around your age I think, a bit older) to find a significant other. But in some ways, for some people college just isn't the place and time.

It sounds like you haven't done all wrong - you did say there was a girl who was into you at the same time you were into her - its all about luck and timing. Don't give up!