Never had an orgasm

I’m 26 years old and have never had an orgasm. I only lost my virginity a year ago and have been with a couple guys since. I am in a relationship with a guy I really love now. We have been together for a couple months now. He makes me so horny and I get wet immediately when we kiss. The sex feels good and he tries so hard to get me to completion but I have never been able to orgasm. My boyfriend tries all he could and goes for a long time to try to get me there. He asks me what I like and how I like it, but to be honest I still don’t know. I told him I got close before but I’m not sure I actually have. I don’t know what it feels like to get close to an orgasm. I’ve never really played with myself so I’m just very inexperienced. I want to help him be able to get me to orgasm. I want to know that feeling. Any advice?