I Dont Want To Live With My Mom Any More - How Do I Get Out?

In all reality, due to your age, dragging your butt home is not going to be a high priority for the authorities in any state since by the time any action would be taken you could very well be 18 and not subject to the courts rule anymore anyway. (although that would not prevent a state from seeking charges for the time you were a minor if they truly desired to do so)

If mom will let you stay with the BF, then accept that and when you are 18, you are on your own anyway.