Tell Dad you want to live with him, ask him to file a Suit Affecting Parent Child Relationship and get custody of you.  At 15 years of age, you do not have a say in this it is a legal matter that the adults must fight out, but you can tell your father that you want to speak to the Judge (Before the most recent changes to the family code, you could have signed a choice of managing conservator statement but that has been done away with).  When you get to see the Judge, tell him/her why you want to live with your father.

Unfortunately, you cannot start the process, your father has to do so.  Talk to him, let him know what you want and how you feel.

Roy L. Reeves

Reeves Law Firm, P.C.