Terrible sex life

My boyfriend and I have been together for about a year and a half and during all that time I haven't been able to finish with him once. It's come to a point where I'm extremely frustrated and I don't even want to have sex anymore because I get little to no pleasure from it. He's never had a problem to reach an orgasm, but ! apparently do. I lost my virginity to him, he's the only man l've had sexual relations with and at first I thought that it was normal that I couldn't finish because those were my first times, but now it's been over a year and I still can't reach an orgasm. Toh most of the times I don't even really feel any pleasure when he's inside of me, I don't know what's wrong. For anyone thinking it might be the size of his penis... that's definitely not it, so l don't know what we're doing wrong. Aside from that, I suppose he likes going down on me, but I didn't use to like it because instead of feeling pleasure, I felt pain. I communicated that to him eventually and he actually listened and changed the way he does it, so that now I can feel pleasure when he's doing it, but still I can't finish. I don't know what to do, it's so frustrating. Does anybody have any tips at all? I would love to improve my sex life with my partner sooner.