My Wife Doesn't Want To Have Sex... What Do I Do?

My wife does not have seem to want sex, and she never initiate sex. I'm at a loss here. I work hard. I try to help her around the house. I flirt with her she's okay snuggling or kissing, but the moment she feels or the things are moving towards sex she shuts down. She says that I don't give her enough space to initiate. So I back off and then I wait and I wait and then nothing ever happens. Then I feel sad, grumpy, withdrawn, and rejected. When I bring this up to my wife, she gets frustrated saying that I'm in charge of my own body. And if I want something I should ask for initiate and initiate it myself, having sex less than once a week, isn't enough for me. I'm starting to feel resentful. I'm reluctant to initiate because I'm tired of facing the rejection. What do I do?