Some parents were awful back then and are awful still. The process of raising you didn't turn them into grown-ups. Parents who were clearly imperfect can be helpful to you. As you were trying to grow up despite their fumbling efforts, you had to develop skills and tolerances other kids missed out on. Some of the strongest people I know grew up taking care of inept, invalid, or psychotic parents--but they know the parents weren't normal, healthy, or whole.