Hey OP, speaking from someone with abusive parents you absolutely still need to see a doctor. I get what could happen if they blow up, rage at you, etc - but permanent damage is a serious deal. If you are scared, think of your future self, the one who has already escaped and healed from their influence. Trust me, that person is gently urging you to go seek help. If your parents refuse you need to take whatever action gets you in front of a doctor. That's asking neighbors, friends, teachers, whoever will give you the time of day until you get the help you need. Think of this like taking care of someone else if it helps.