Orgasms

I️ am in this relationship with boy, and when ever we have oral sex or sex, I️ am never able to have an orgasm. I’m the only girl his Been with that he hasn’t been able to have an orgasms. I️ feel as if I️ was less than the other girls because I️ can’t. I️ never have before by myself or with others. And I️ don’t really know what it feels like. How do I️ have an orgasm?