I'm pretty sure it was rape. Raping is when someone has sex with you and you TELL them that you don't want the sex. You told him that you wanted him to stop, but he went ahead and did it anyways.
Don't feel guilt. He is the one who didn't stop when you asked him to.
I would tell a trusted adult and have the guy reported. it might be emotionally hard for you to tell someone, but in order to have the guy dealt with you are going to have to tell someone. We are here to help you get through this and help you tell someone.
And please don't
SH yourself, it isn't getting you anywhere, is it?
Hope this helps, feel free to
PM me anytime you want to talk.