Haven't had an orgasim...

So I've hooked up with 4 guys and non of them have yet to make me have an orgasim. Am I doing something wrong or are they? I really want to know what one feels like because everyone says they feel good. Any good tips on how to get me to have an orgasim? Also I haven't cummed either. Or I think I haven't. How do I get these things to happen during intercourse?