My friends keep asking me if I'm a rape victim and I'm not so I ask why they keep asking me and they tell me I act like one? Is it normal to act like a rape victim when you've never been raped? I don't understand how I even act like one, like I asked them how I act like one and they were like, "You just do."

Well, rape victims typically act like normal people. You can never really tell a person has been raped by interacting with them.
A lot of molestation/rape victims find ways to be self destructive if they don't resolve their issues, but this kind of behavior is typical of any trauma.
"Oh hey Mitch, did you see that game. Great huh. So... got any trauma that you wanna talk about? Mitch don't be like that's it's not awkward, we're all friends. So... did anyone give you a bad touch?"
My guess is that you might've had a rumor spread behind your back and your friends are investigating.
Or are your friends just jerks and messing with your head?