What to do in a relationship where your criticized constantly?

My fiance is constantly criticizing me. It has gotten to the point where I have no self esteem and do not feel confident in myself. Family and friends say im beautiful just the way i am but everytime i look in the mirror all i see is this hideous person. Sometimes he says hes just playing but it hurts my feelings. We have a 3 year old and its been hard to lose the extra weight. One day we were watching tv and i lifted up my arm and he said " Do that again" and i said why? And he said " Oh no your arms are flabby " so now I try not to lift my arms up around him. Also if i have a little stubble on my armpits he also criticizes me for that. He has these "fat" jokes about me and he says its playing around but I dont like them. I also smoke and so does he but he criticize me for it and says I need to quit. Yesturday we were watching tv and I was talking to him about something and he cuts me off and says" did you brush your teeth? Your breath really stinks!" So I do brush and floss but now im afraid to even talk around him. If i dont straighten my hair (its naturally curly) he also criticizes me and tells me to straighten it. I feel like Im walking on eggshells in my own home constantly trying to be what he wants me to be. I dont feel good enough for him...ever! Im exhausted and I dont know what to do...