Answer:
Depends on where you live. In most States in the US you are not a legal adult till you turn 18. You can only move out of your parents home if they allow you to. Plus is it your boyfriend's home or his parents? If it is his parents, I suggest you sit down and discuss it with them first before you make any moves. On another note, why would you want to move in with your boyfriend's place when he is only 18 and more than likely a lot of growing to do yet. At 17 and 18 you both have some living to do before you decide to settle down. Moving in with someone is a big relationship changer at any age so before you make this big leap make sure it's really the best thing to do right now.