A quirk in the way the law of your state is written means that if you were to run away from home at age 17, some law enforcement might be reluctant to return you home as long as you were in a safe place. However, that same quirk in the law means that if your parents showed up and dragged you bodily back home, law enforcement would look the other way.,
When you are 18, you can move out and there's not a thing any one can do about it. At 17, it really depends on how determined your parents are to make you move back. You are not legally an adult at 17.