Suggestions please ladies 😯

I'm 20 years old and I can't cum/have an orgasm or I don't know how. I think I've only came a handful of times and it was years ago with my first boyfriend and once with the guy I've been sleeping with since last October. He does everything right, he rubs my clit, eats me out, and idk he just does it right. He asked me to get a toy to maybe make it easier for me to cum and have an orgasm but it still didn't work. What do I do? I know it irritates him because it irritates me. I don't want him to leave because he can't make me orgasm or cum.