Can't enjoy

I grew up with a faith background and the thought sex is for marriage. I decided I wanted to have sex with just one person and when I met my boyfriend we both just knew we were the ones for each other. I decided I was okay with sex, and we were doing it for a while, but I cannot orgasm no matter what he does. Part of me thinks it's the non-committal part of our relationship and I'll be able to relax more after we get engaged or married. I can orgasm on my own, so I know my parts work. Anyone else ever have this happen to them?