He's shy romantically, not about anything else

Together 7 years, married 2 1/2. Our sex life has never been outstanding by any means. And I've tried everything I can to make him want it. But if I pursue it, he's "in pain" or "tired" or "has a headache." He wants to do it once to twice a month, a certain day, a certain time, a certain spot, when I should already be in bed to get a full 8 hours if sleep. Should I stray from the idea and think we will have sex a different time or day, I will be let down. And it's boring. Just complete unfullfilling unromantic sex. And I'm not shy at all. I'm naked or have very little clothes on at home most of the time. I will talk openly about sex and what I want. And he just says "I'm shy," I was raised conservatively about sex. Funny thing is, he's not shy about anything else in his life. Nothing. What the hell do I do? This just sucks.

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