My family successfully ruined my life

He has bullied me throughout my life. Ruined my confidence and self esteem. I tried living independently but the damage was too much. I'm back with him and my mum now. When my mum goes out shopping and I can't cope going with her I'm stuck with him. And he starts being nastier, because he knows no one's there. I went out today and drank a bottle of wine because I felt so depressed being stuck with him. Then I sat by the sea, just looking out. Some busybody called the police and I got apprehended by them. They became convinced I was a danger to myself, they are being overcautious. Just because the sea can drown people and someone's sitting near it drinking a big bottle of wine, they automatically assume I'm going to do that. So now they brought me back home and told my parents to call them if I leave the house. Sounds like a bloody police state! And still my dad plays the innocent one, always gets away with it, whenever anyone like the police come, he always is ever so nice.