You are still too young to begin to appreciate the negative affects the abuse you have endured will have on your life....once we get older and leave home, and the abusive situation, That is when it really begins to fall apart---you might look for "love" in abusive relationships, or even become abusive yourself if you decide to deal with it by rationalizing how you were treated, or simply out of an inability to control your feelings as you never had the opportunity to learn to do so----------think hard. Would you treat your child as you have been treated? Would you want it to be different? Your dad is being held accountable for his behaviors, which are criminal. Maybe, just maybe, he will have an opportunity to take responsibility for his actions and make a decision to change. Of course you love your parents, but that does not make what they do, or how you take it, right or healthy. Someone could literally die, a hit gone wrong or too far, a neck breaking in a fall, ....
Do you like your parents and what they do? Do you want to be just like them?
You deserve to be treated with respect and compassion, limits can be set without violence. Your friend was brave to call the police. Please do talk to a professional about this,
or at least stay here, read the forum for Survivors of Abuse---talk to others who have felt as you do and have "walked" in your shoes. Take care, give yourself a hug and accept hugs from others. I think you have a river to be cried one day. (((((hug))))))