Lost My Virginity this year and.....

Well, I lost my virginity to my ex-boyfriend and had sex with him a few times. Of course the first few times it hurt, but after that it didn't. The times after that, I would breath heavily but I wouldn't feel a whole lot of anything. I'm wet, but in my mind I am not turned on when having sex. I don't know how to explain it? I like him and I am attractive to him but when were having sex I just dont get turned on the way I do when I masturbate by myself. I have done this since I was young and so I know how to turn myself on/ cum. So why don't I feel pleasure when having sex with someone? Is there something wrong with me? How do I feel an organism when having sex with someone instead of experiencing it on my own? Is this normal?