what to do about an abusive parent?

I drink mochas not 100% coffee, mum mum calls me a druggo and accused my friend of drinkin becuse she smell like grog but she dosn’t drink we just went to the movies! my mum calls me druggo cause I alway drink mochas funny thiing is I dont drink it that often! I tried doing chours and stuff but she wount get offf my back,when she accussed my friend of drinking’ she expected me to help her when we go home. than she punish me cuase I wouldn’t hellp her. personely I dont think she deserved my help. my brother 21 and drinks and smokes and when ever I have herbal tea or anything with coffee in it she compares me to my brother. she did the same thing to my brother and he droped out of school started smoking and drinkin hes been to juvy and I partly blam my mum! when me and my brother wherer little she alway belted us wth a wooden spoon, belt, spatula, hit us accross the head bare hand. and I suffered and had many panic attack witch I had no idea at the time! when I got older I started fighting back. and I even threw hot pizza at her face after she hit and verbaly abbused me. she pour cold water at me when I told her to go away! I thought about get out of the house and going somewhere esl but I got nowhere to go and no money! what should I do??