I’m 15, Role playing with a 20 year old (fake characters, never ourselves) is it alright for me to do this?

I role play often, ahd there are sexual themes involved sometimes, but it’s always fictional characters. Never ourselves- like an animated character. He’s 20, and I still kinda feel weird about it. I wanna keep rping, but i need some reassurance that it’s nothing crazy. I would never get into a relationship with this person, just there to rp. Please tell me this is okay!