Q&A: How Can I Have An Orgasm?

I am 21 years old and I have been with about 20 people (guys and girls). I have been in a relationship for more than a year and he’s great; but he hasn’t been able to have me reach orgasm. I am getting tired of getting him off and he tries to get me off but it just gets me angry and that is all I focus on when I am with him.