I'm sorry to hear that you're suffering so much. I don't have the issue of my parents being of different class, although I did suffer an abusive upbringing with parents who were different because of their deafness.

Reaching out for support here is a great first step...online therapy may even be of help. I have found that pinpointing a cause - although helpful to provide some understanding - is only part of the equation - and that most of the value comes from being self-aware and willing to work on evolving.