timed

I am alone in a room, only a short time i have been here but where am i now i am somewhere anybody knows. I am this persons double i am not a friend i am an enemy, Do you know who i am ?. I hit this person when i am upset and this person hits back but yet we always make up yet this person is always in trouble.
i am someone to be hated yet someone to be loved i am a sister and my sister broke my arm and was sent to her room although i am angry i am forgiving also.