Will a judge put in custody papers forcing a child to live with a parent after they turn 18,bc I told my dad I wanted to move in

It's routine to put a clause in the support section of a divorce decree a stipulation that support continues until high school graduation or the 19th birthday, but the custody and visitation portion effectively ends on the 18th birthday. As of that date, you're legally an adult with capacity to enter contracts, vote, etc, and the court loses its jurisdiction to compel your living situation. The child support obligation can also shift from the formerly custodial parent to the adult child. I'm curious, have you seen the divorce paperwork?