I agree. You're very uplifting on this site and I'm glad you are here. We all get depressed to varying degrees now and again (or a lot for some of us, myself included) but at least we can love each other and be supportive even in the midst of our pain.
Definitely it's the chemicals/depression talking. You're not worthless. None of us are. Like soldiers battling side by side or friends sharing heartache about their relationships. We're not perfect, but who the hell cares. We're doing our best to get well and become more and more functional and happy. That's quite a lot in my opinion. And you rock.

I'm never wrong about these things.