If you're depressed then any assessment you make of your accomplishments, failures, prospects, etc. are going to be so negatively biased as to be not credible. In other words, you can't trust your own objective self-evaluation while in a depressed state. If your mental state were to improve due to therapy or an antidepressant prescribed by a psychiatrist or endorphins from exercise or some other change in circumstances, you might see your life in a whole different light that would encourage you to start or advance in a career, begin or renew personal relationships, find pleasure in a sport or hobby, or other positive outcomes. I don't believe in your depressed assessment of yourself, and neither should you.