Please don't carry the weight of their problems on your shoulders alone. If your insurance doesn't cover mental health services, most counties in the US offer free or income-based fee counseling. A good counselor can help you detach from their problems and teach you how to handle them without stressing yourself out as much. I don't know if your parents would consent to counseling, but sometimes when they see us handling our problems appropriately, it encourages others to do the same. God bless you. Good luck.