Why do I never get asked out by guys?

I get told by all my friends that I'm naturally pretty. I'm athletic and tan. I am friends with almost everyone in school, but I wouldn't consider myself to be popular. I'm pretty nice but not too nice. I'm kind of girly but not to the point where it gets annoying, and I have a pretty equal amount of guy and girl friends. I'm a bit immature, but I'm not fake (meaning I act like myself), which is one thing I can say I'm proud of. I always seem to be liked by all the guys that I don't like, and that kind of bothers me. I'm going into the 8th grade (13) and I've never had a boyfriend. Can someone help me? ):