I don't want to have sex with my husband anymore?

I'm 22 years old I've been married for almost 3years and I've lost all desire to have sex with my husband! I Used to want to do it all the time! Once a night never was good enough , now I shy at the thought of it. I try to make awkward conversation when I think he wants to do it , I dread the thought of him seeing me naked or touching me I just don't like it anymore!😔 on our last occasion I cried when it was over and walked into the bathroom refusing to speak , I live my husband very much I just don't understand what's happening in my mind right now! Has anyone experienced this? HELP!