Start discreetly building your life independent of your parents. Do you know what you want to do with your life? What career you would like? Look at grants and assistance available to you so that if your parents decide to pull the rug out from under you there is support you can access. Start to build a support network outside the organisation. Reconnect with relatives and friends so you have people to go to and confide in.
having goals and direction is important and provides focus. You have your whole life ahead of you so embrace the opportunity to fulfill your potential. In this instance plan for the worst but hope for the best.