Never orgasmed! Please help!

I’m 24 years old and have never had an orgasm! I have masturbated I have tried toys while having sex with my SO but nothing! Sometimes I feel like I’m right on the edge but then it all goes away and my clit gets very sensitive and then I can’t have my SO play with it because it hurts. I try try try and it doesn’t work. I get so worked up about it because SO thinks it’s his fault. I’ve had multiple partners who left me because they thought they couldn’t satisfy me. My SO and I have been together 5 years and the sex is fucking phenomenal. Omg. It’s breathtaking, but I’d like to have my “grand finale” also! Please give some advice!