To be honest, I say keep trying and don't get discouraged. While joecode is correct that you might need to be more realistic about some of your goals, if you keep trying, you will find success, even if it's modest.

If you're interested in doing another webapp, I say do one start-to-finish completely on your own. That way, you don't have to rely on the dedication of other people for it to be successful. Also, try to reach out and find other people interested in tech entrepreneurship at your school - I've found a surprising amount here (Washington University in St. Louis) just by poking around.