I once had a girlfried who had depressions.
Most significant was that when something didn't work for the first time, she instantly stopped trying and shouted about that. She lacked confidence and was quite lazy. People easily went on her nerves.
She would try to hurt herself (scratching) cause she felt that she did bad at some things. Self punishment.
The girlfried I now have learns occupational therapist and told me, depressive persons miss something in their brains that emitts endophines. So they are indeed less happy and need easy and cheerful tasks to manage.
The lack of endorphines can be balanced by drugs.
That's my semi-scientific / semi-experience - knowledge of depressions.
