What grade are you in? Trust me, don't react to those rumors, just ignore them and go about your day. These gossipy people are just looking for their payoff, which is your reaction. So don't pay them!
If they say something nasty to you, just say "Wow, that's news to me!" Smile, and head to the next class. If they whisper behind your back, simply don't acknowledge them, because they want to hurt you, and that's sad.
Remember, sticks and stones will break my bones, but names will never hurt me. It's a very true saying!
Love and hugs to you,
Sharon
(I'm a grandma and I was a young lady like you once, and I went though the same things.....Being a teen is soooo hard! You hang in there!)