Trouble orgasming!!

Someone help!! I'm having trouble orgasming 😩 I've never had one, at least I don't think I have; I've had the build up that felt like I was going to but then didn't. My bf feels bad that he can't "fully satisfy" me & I feel bad for it. I've been working at this for a year and a half now.
Can I get some advice on what I should do/try??