Nonexistant sex drive.

I've been with my now husband for 12 years. I've been on birth control for most of that time. We use to have sex frequently no not so much. His sex drive is through the roof and mine is nearly nonexistant. It literally turns into an argument all the time. I'm selfconcious about my body and he says I push him away because of this. That there is no spark anymore and I'm singlehandedly ruining our marriage. We have not even been married for a year yet.