Can’t have an orgasm?

So I am almost 24 and I have never had a vaginal orgasm. I feel scared because my fiancé hardly ever does oral on me. Most of the time in the past I could achieve a clitoral orgasm and now that’s starting to fade. It’s just harder and doesn’t feel as good and I’m unsure why. I have always loved sex. I’ve tried things that turn me on and I will have an orgasm but it just is like “okay cool” lol not as good. It’s hard to explain what I’m saying but a few years back it use to feel so good. Also I feel super nervous about my fiancé I just feel like the people in the past he has been with had vaginal orgasms because he hardly ever does oral. Just makes me feel different 😞