Please help me :( ..............?

Okay right.. Me f**kn ex has gone and spread f**kin rumours about me saying I have done everything except *it* with im.. I havn't! I'm only 15 like!! What am I going to do if people hear it and believe it? Please help. His new girlfriend is spreadinit too. I don't want every one to hear it and think im a tramp. (His new girlfriend is my ex-bestfriend)