Help, how do I get an orgasm?

Hi, I am 27 years old and have been married for four years but have never experienced orgasm. Ever since I started having sex I do not feel anything and I understand that orgasm makes a woman feel good. My husband gets angry when I do not "come" so I have been faking it all this time. I love him but he is terrible in bed and I like sex very much. Sometimes he is not in the mood or he is too tired to have sex. We only have sex when he wants us to so I think he is only after satisfying his own needs. Please help me on what to do to enjoy sex!

{Lily}