Is it normal for girls to have dreams about sex?

I'm just about to turn 13, and I'm having these weird dreams where I'm with a hot guy, sumtimes guys from school ans sumtimes guys idk. And we're like, doing it! It's really weird and gross and kinda fun and interesting at the same time. But I thought only guys wer suposed to get these dreams. Am I a perv?! And even though i don't hav dreams about having sex with girls, culd i be gay? Cuz i dont relly know wut gay means but wen kids at my school don't like sumthing, they say it gay. And they say that gay people are like having sex all the time. Please help me i'm scared.