Excellent comment. I have been struggling with some form of pseudo-depression (never got diagnosed) due to some odd mixture of social anxiety, too much narcissism, lack of motivation, poor biochemistry (probably porn addiction and too much "releasing"), malfunctioning relationships with parents/friends/coworkers. Its hard to actually wake up on any particular day and feel that "things are fine", so all my mind's resources are spent justifying how I might or might not be fine, reading too much internets about alleviating problems for which I might not even have, etc.

There was also an excellent thread and discussion a while back suggesting depression is more of an evolutionary mechanism: https://news.ycombinator.com/item?id=16216647.

I also wonder how much of depression is attributed by improper biochemistry in the brain, low serotonin etc. even though your environment/situation is actually fine.