Orgasm help

I've been having sex with my man for about a year now and not one single orgasm has happened for me. He was the first person I've ever had sex with and no one has ever had me orgasm except myself. I want to have that connection with him, but when we get down to it I can't ever finish. I'm not sure if it's all in my head and I can't let go or if I'm just that inexperienced. Any advice?