Stormi, states have custody laws which are all pretty similar. Generally a court will award custody to the parent based on the best interest of the child. When there is a custody battle the court will sometimes appoint a person known as a guardian ad litem who observes and reports there findings to the court.
Your age is probably going to be very persuasive. In other words all things being equal the court is likely to grant the wishes of someone who has attained your age.
I had a boyfriend who had been married to someone, they had 2 kids, the boy was "allied" with his dad, the girl with her mom. They were both staying with the mom, who was abusive to the boy and wasn't feeding him (really! He was living on eggs from a neighbor's chickens and he was quite skinny.) He was 14 and he wanted to live with his dad.
I asked someone about this & I was told when the child is 14, it's no longer really a question of custody, the child can choose where they live.
The boy did end up living with his dad.
Maybe Social Services could help you to stay with your dad.