Depressed

Sometimes I don't know how my brain works. I really don't have much to worry about but yet I feel depressed. Or is it due to the broken lock on the door? So why do I worry? Is it because I feel that I am the only one who cares about keeping things in good working order? Or is it because no one else cares about the house besides me? Is there something wrong with me? I don't know, just feeling depressed today. Maybe it is because of my aching back? Maybe? No..... Then what? This sucks.