depression

I'm just curious on how many of you guys have depression. Further more, I would like to know whether you were self diagnosed or not or how you feel about self diagnoses.

See, the reason why I'm asking this is because my class was having a lesson on well being/mental health and the teacher had said that you should never self diagnose yourself with depression, because it could be dangerous and worsen your mental state.

BTW I don't have depression nor self diagnosed depression, but I've just been wondering since I know many of you here self diagnosed yourselves with depression.