Does my mom abuse me ?

I am so sorry to hear your situation. I go through the same day by day, and yes, that is abuse, whether it is physical or emotional. The best thing to do is, obviously, talk to some family member you trust and that you know can get you help. It's a serious problem, and you she has no right to mistreat you that way, since she was the one who gave you the gift of life in the first place. Plus, as a human being, that's not a healthy way of living, either. Tell somebody you trust and love about your situation, and don't believe your mother when she says you are a piece of *****. You are much more than that.