Why can't i orgasm?

Autumn
I've been having sex since I was about 17 , im 21 now and my boyfriend and I fuck like jackrabbits. The problem is for all these years I've never once orgasmed from a dick in me. I've orgasmed while I had one in me but only because i was using a massager at the same time. Will I ever be able to? What's wing with me? The sex is amazing, why can't I orgasm?