Sketching and depression

I've just been doing a lot of fashion sketches today. Fashion design is a bit of a hobby of mine. I mostly draw goth outfits and fancy ballgowns. I've just been in a crappy mood today and haven't felt like doing anything but draw. I just feel really worthless sometimes. I'm also really ashamed of some of my recent behavior. Sometimes I wonder if maybe I need therapy for my issues, but then I would have to admit my problems to people. It's not like I ever endanger anyone else with my actions. I don't drink or do drugs. I just have this one bad habit that I really need to quit. I know its not good for me, and I've been trying to stop doing it, but it just gets really difficult sometimes. When I get depressed like this its hard to stop thinking about it. I know I make the one person who really cares about me worry all the time, which I feel really bad about. I just want to be able to fix everything, but I know I can't.