A: Simple answer - the Court Order controls.
That said, my #1 rule in family cases is "be nice". If you can accommodate a different schedule it is the moral thing to do. If the other party is being entirely unreasonable, then you don't have any obligation to accommodate them.
Just ask yourself this: "If I was in their shoes, what would I hope for, and is it reasonable?"... and think about the child. What do they want?
There's a lot at stake here - a child that needs both parents.
A: That depends on your age and maturity.
If you are 10, then yes, police will apply pressure for you to go home. And they'll call DHHS.
If you are 17, different story.
You can apply for emancipation and the court will give you a court-appointed lawyer assuming you have no assets.
Sorry you're going through this...