orgasm problems

Cassie • 26- Married - 2 sons 🥰 - Baby #3 on its way!
Girls I need help I still have yet to have an orgasm during sex.  I've had maybe three during oral but even then it's so hard the only way I can seem to have one is with my vibrator. Help please! Tips or something. My boyfriend feels like it's his fault and it's not.