Is there anything I can do?

I had a friend over today and she was helping me pick out pictures for my myspace page and my "friend" said, "Geez, don't you have any GOOD pictures of yourself?" It made me really mad. See I want to have a good self-esteem but I have Trichotillomania (compulsive hair-pulling) and I really can't stop. It's kinda like OCD where you get urges and have to act on them. Well i pull my hair out on top of my head everyday. I hate it when other girls who have pretty hair and no bald spots say "Ugh, I hate my hair". All I can think is "Hey wanna trade?" I have tried so hard to stop and I can't go longer than 2 days without pulling. Because of this disorder I have low self-esteem and I have worn a headband everyday for the past 2 years to try to cover the damage. I don't even know what to do anymore. I desperately want pretty hair and good friends but I'm scared to be close to people and most ppl don't like me because I'm so insecure. What should I do? How do I get good hair and good friends?