You already have a couple of very good answers, so the only thing I might add is that your parents are out of their skulls, if they don't choose to seek professional counseling. Perhaps, if it comes from another professional, such as your brother's doctor, teacher, minister, etc., a recommendation for seeking professional help would carry more weight. If you can tell them what you've told us here, maybe they can intervene and help improve things. In the meantime, you need to go to school, get a job, join the military, anything that will get you out on your own and away from this dire situation. Live with a relative or friend. Get an apartment with a room mate. Rent a room in someone's house, almost anything would be better than this. Good wishes, good luck.