What do I do

This is going to probably be a bit disorganized so bear with me. I am a 15 year old girl and I pick at my scabs and pimples and eat them. I pluck my eyebrows, sometimes the hair from my head and hair from my legs and arms. I chew my fingernails until they bleed and eat the nails. I scratch through my head to find peices of dead skin and eat them. My life is fairly normal but at a young age I was diagnosed with Clinical Depression and have been through several different medications. They work at first but they end up just wearing off or I grow a tolerance or I don't know. I get even more depressed because I know that I have no reason whatsoever to be depressed in the first place and that makes me feel even worse about myself. I'm slightly suicidal and it ties a lot into the picking and stuff. I'm obsessed with it. I have acne on my chest, neck, ears, back and face and I am constantly picking and scratching at the scabs and pimples, even in school. I try to do it descreetly but I know that people have noticed and I know that on a few occassions people have spread rumors and/or talked about what I do. I definetely think everything I do is related to stress. I do everyhting usually when I I've had a fight with my parents (Which is often) Or right when I get home from school, kind of like a way to calm down. My parents know about my hair pulling and the picking but not about the eating of the pus and scabs. Whenever they notice that I haven't listened to them and stopped picking they yell at me and punish me for it. I also think I am trying to prove that I'm not beautiful, like people say I am. I'm chubby and have a weird nose and I hate it when people give me compliments. I pull my hair out of my legs to the point where they are constantly aching and they are covered in scabs/scars. Can anyone help?