What's so different about me? Am I doing something wrong?

I am just about to start my sophomore year of high school, and I'm way more sexually experienced then all my friends.  Before high school the farthest I had gone with a guy is a hug,  but I hit high school and all these guys suddenly swarmed around me. I am very capable of saying no, it's not like I was pressured into anything, but I figured that since I have all these guys throwing themselves at me, why not take advatage of it. In the last year I've done more then most girls do in all of high school. I don't know what I'm doing that's attracting all these boys, I'm not by any means very attractive, and I don't put out or anything like that. I've lost a few friends that think I'm a slut. Am I a bad person for liking this attention for guys? Is it bad to feel wanted?