You need to stand up for yourself. Call the police, and if that is unsafe, pretend to order a pizza. The dispatchers know about the pizza thing. It was assault. You can get him arrested for child abuse. You could also call Child Protective Services if you wish to live somewhere else. Get evidence. Evidence will be your best friend if your dad is abusing you. Get a video of him abusing you. Take pictures of your injuries if you have any. Don't just sit there and put up with this. You don't have to suffer anymore.