[hutzlibu]

"My girlfriend works in a psychiartry for people with depression and she told me that it has nothing todo with success"

Hm, even though I don't work in a psychatry, I would claim otherwise. But I think it depends on the definition of success.

So yes, there are lots of people having depression who are successful by ordinary standards, meaning good career and money. But maybe they focused too much on the money/prestige part and instead should have focused more on doing what they really wanted. But they didn't and therefore failed in life and now blame their brain chemistry for it, instead of their own choices. Much easier, sure.