Why doesnt mom respect me ?? SHE LOVES MY SKINNY SIS.!!?

Sweetie, it is not you, it is her!! That is all there is to it! She is acting immature and you really need to confront her about it! Tell her how she makes you feel, if you don't it could drive a bigger wedge in between the two of you then it already has. Also, who cares what your sister looks like!! Forget about that!! You are a beautiful and compionate young woman who does not deserve to be treated this way, period!! Keep your head up, Girl and be confident!! God Bless!