Am I a horrible person?

My fiance and I are getting married in two months, we have been together for over 4 years. The first year and a half we had sex constantly. The next year it was pretty often the last year and a half it's been less and less. The last 6months it's been 1-3 times a month. It's been driving me crazy. I need sex. He doesn't clean, cook, or do anything nice for me( which I've learned to live with) so the least he could do is have sex with me maybe once or twice a week. I keep thinking about all of these scenarios with other people and friends. I'm getting to the point where I am mean and drifting away. Does that make me selfish?