Oh, my gosh! This sounds terrible. I don't know what to suggest. Can you get a safe, with a lock and key, and put your most important posessions in there? Or a lock for your closet and dresser drawers? Maybe just a lock for the door to your room itself. You may have to let your parents in once a week or so, to see you are keeping it in good order and clean. Wear the key around your neck and keep it with you everywhere.