Female Orgasm??

Gabby

Im 20 years old and just had my first child. But ever since I first started having sex (I was 14) I've never had an orgasm during the actual act of having sex. My partner will sit and play with me for 30-45 minutes using different toys and going down on me, but I have never had an orgasm. The thing is though, I can masturbate and get myself off perfectly fine. Am I the only person like this? It's not like I don't enjoy sex, because I do. I just have never had an orgasm from anyone else.