Changing Child Custody

I'm 15 and currently living with my parents. I want to get my custody changed over to my aunt or grandmother because they take better care of me, support me better, and provide what I need. My parents are legally married but my mom wants a divorce and wants me and my sister. I don't want either of my parents because they both set bad examples for me and I don't need that. I would just like to know what me and my aunt and grandmother can do about getting my custody put with them.

Children do not get to decide their legal guardians. That goes double when the biological/legal parents are in the picture and willing to parent. If your parents are willing to let you live with someone else, that is fine, but your grandmother and aunt can still be your role models without you living with them.