What do i do about these rumors?!?

So there is this guy in my grade (popular) and then there is me (not the most popular qirl in school) oh and by the way i'm in eiqhth qrade. . . Anyways people are spreadinq rumors about me and himm like sayinq that i qave him head and everythinq when it isn't true! Tomorrow people are qoinq to piss me off because i'm sure they're qoinq to come up to me and ask me a lot of bull, what should i tell the people because i just can't say "no, it's not true" because then they may say well that's not what i heard from all the other seventy people in our qrade... Anyways what should i say or do to the people in my qrade?! Please help me i need advice quickly...