I am abused brutally by my grandmother pls help!?

My grandmother is a wonderful woman. But lately she's been feeling the affects of retardation. She is my legal guardian. She has been denying me food, and my sister also. She watches us shower and when we get out she denies us towel and insists we drip dry like"normal people". She wants to brush my hair, but when I **** down she hits me with it and screams "bruce" which isnt my name. My name is norman. It makes me very sad, because i love her but i need to leave. i cut myself with an apple peeler everynight. pls help?