Clueless!

I'm pretty young and i've 'been with' a few boys, but i never seem to be able to enjoy sex. I sometimes i have to fake my orgasms, and continue to scram the boys back because I want them to believe i'm enjoying it as much as they are. I also hurt a lot after sex, and i continue to fall in love with these 'one off's ' what can i do to help this, please