Unable to orgasm or cum

I have never understood why I can’t orgasm. I’m unable to do it through maturation or sex, I just don’t understand how I can’t, when everyone else seems to be able to. The closest I’ve ever got is when I felt a nice pleasure feeling whilst maturating, but nothing ever came off it. I also feel bad when my boyfriend is the only one that cums during sex, because I can’t, I wish that we could both be able to achieve it together.

Has anyone got any help and advice? I’m willing to try anything I’m comfortable with