Regardless if there is MI and what it could be, does seem like the behavior that results from inner turmoil and rage is something to truly consider resolving. It's not something that just goes away on its own. Nothing that one grows out of without addressing the root causes. And it's something that can push others away, that might not want to be pushed away.
It does sound compounded by tension in your home. Is your biological father a presence in your life? Sometimes it takes the non custodial parents support to offset the personality differences between the child and stepparent.