In Massachusetts, custody of children is determined based on "the best interest of the child" which the court decides after hearing the circumstances as you state. Your father can reopen the custody matter in the Probate and Family Court of your county and seek to modify it.
In such hearing, being 17 the court will consider your personal choice as well, as a factor (among others) to reach its detremination.
Answered on Oct 31st, 2013 at 1:06 PM