There's nothing wrong with you. If you don't need sex to make your life exciting and fun as a teenager, then kudos to you. Maybe all of your friends are doing it because they feel like that's what teenagers are supposed to do--because they can, they will. They might even be compromising for something--something that you have. You have freedom, and independence, and individuality. Maybe they feel like sex can complete them. But by doing it this early on, and so casually, they've stripped the meaning of "making love" for themselves. When you have sex with someone (because you'll actually love this person), it will have a lot more meaning to you because you waited. If you're going to be single, anyway, indulge yourself. Walk into school with your head held up high, with a cute outfit on (not slutty, flattering: there's a difference), and a smile. Be confident. Make lots of guy friends, and approach them/talk to them casually. It will show everyone that even though you're a virgin, you know how to handle yourself around guys. You'll also appreciate how nice it is just to be friends with guys rather than sleeping around with them, because as their friend, you'll always get more out of a relationship with them (a friend) than a girl who sleeps around would (sex).
Be the girl that doesn't need a guy to be happy. Be the girl that guys like, but can't have. Because that's so much more appealing than a slut who gives herself up to every guy she's attracted to. Guys like a challenge as much as (if not more than) they like easy girls, but the difference is that boys will have the time to see you for you, not how good you are in bed. There is one thing that puts you on a whole 'nother level than the other girls--your dignity. Use this to your advantage. A girl who is beautiful and unattainable really appeals to guys. Work on your image, and your confidence--being a virgin is nothing to be ashamed of. It's something you should take pride in. There is nothing wrong with you. I've never even been kissed, and yet guys like me. I have a lot of admirers, and I don't let that kind of thing bother me. Don't let it bother you, either