It is imperative that you immediately contact the authorities to let them know what is going on. If you don't want to do that first, you need to call a friend and ask to speak with their parents. Explain what's going on and ask if they'll come pick you up so you don't have to be in the house alone while deciding what to do about your father's decision to abandon his child. I know that many abandoned and abused young adults are afraid to do contact police and social services because they fear they'll wind up in a foster home, but that really isn't going to happen overnight entirely against your will. What will happen immediately is that every effort will be made to preserve your safety and keep your life running smoothly.