[syncmaster913n]

"Depression is a first world problem, generally."

Do you have a source for this? Thank you.

"It is very hard to find an unselfish person who is depressed, unsure about what to do or unhappy in general."

That depression and unhappiness are more difficult to spot in people who are selfless does not necessarily mean that those people are significantly happier and less depressed - it could only mean that they care more about how others perceive them and may, therefore, be more likely to hide their true affect.