Rumors are pretty bad. This situation seems to be really bothering you and I can understand why. It is hard to deal with people believing things about you that aren't true no matter how strong you are and how much you know that you are not supposed to let people get to you. School sometimes just seems to breed some kind of atmosphere where all people can do is talk about each other and things that they don't know anything about.

I think what you need to do is to continue to try as hard as you can to ignore these people and then remember all the great things about yourself when you are feeling really down. Try to just be around your close friends for awhile until the whole thing blows over. It seems like you are strong and understand that the opinions of other people don't really matter but I think you really have to believe this at this difficult moment.