sex doesn't feel that pleasurable ??

I'm 17 and I don't feel like having sex because when I do it doesn't feel that pleasurable and it almost feels like I'm loose .. i have never had an orgasm through sex although I have through getting licked out , I love my BF very much and I do want to have sex with him with go through times of having great sex what I love and then other times having sex what I don't enjoy .. can someone help is there something wrong with me ?