Anyone else??

Okay so I was always a very sexual person. I started masturbating when I was 6, lost my virginity at 15 and had slept with 23 people by the time I was 19. I'm married for almost 2 years now I'm 21. And I am literally NEVER in the mood. We have sex MAYBE twice a week. Sometimes we will go a whole week with out it. I hate it. I feel like a bad wife. I Don't understand why all of the sudden I'm not sexual at all. I mean I still masturbate on an almost daily basis but I never want to have sex. I need help. I Dont know what to do or how to change it. Has anyone else experienced this?