Hello Mockingbirds531, welcome to Psych Central.

Losing interest in things that you once enjoyed can be a symptom of depression Depression Symptoms, Information and Treatment - Psych Central

It also sounds like the home life you had with your parents arguing may have affected you. It would be a good idea to seek therapy to talk through these issues. Often as children we take on the blame even when it is not our fault. Go see your doctor about medication and therapy. We also have a very good Depression forum that you might like to share more in with other people that feel like you do. We also have an Eating Disorders forum.