Sweetie-- there is NOTHING wrong with you. You are surrounded by sadistic and controlling people who just use you for there pleasure. All the symptoms you describe are listed as parts of depression. Anyone would feel bad in your situation. There is NO excuse for the way they have treated you.
You sound like a sweet, sensitive, articulate person. I understand how hard it is to function in the world when one is shy and sensitive.
I don't know about the job situation in your area but maybe online you can see what kinds of work employers are looking for. Is there a women's shelter in you town? If you can get away from your situation a little while maybe you can get some training to get a start on the job market. I know some kinds of work that requires a little training but they usually have some fees attached. Maybe you could get a small student loan. These jobs are 1) nurses aide--sometimes just a few weeks training is required, 2) beautician-- I have been told that this is a recession proof profession ,3) look for work at your local hospital in housekeeping, food service and central supply dept.
I really feel for you and mostly want to make you clear that none of this is you. It's the situation you are in.
Please keep posting