Impossible orgasm

Alright the topic explains it all but I'll make this short. My boyfriend and I have been together for 6months now. We have sex often and yes I enjoy it but I can't get off. Actually I've never experienced an orgasm. Maybe somethings wrong with me idk. Even when he gives oral I still can't get off.  I don't want him to feel like he's not good enough of a lover because he truly is, his actions make me feel awesome but getting and orgasm is just impossible. idk what to do. Help please