Is it normal that my mum is so mean to me?

Well she always have mood swings and she always put it all out on me. Thing is her friends said I look thinner. Then after that, she scolded me for being ugly and skinny that me sleeping so late makes it even worse. Come to think of it, I don't go out and have any vices. I usually spend time on the net reading and watching movies and this is the treatment that I receive from her. Now she gave me curfews and basically have to tell her everything. Btw I'm 21. I love my mum just mostly she hurts my feelings without her not knowing it since if I tell her she'll fight back. I always feel pressured and isolated around her like I have no freedom to do such.