Exactly! A lot of people in developed and developing countries are depressed because they thought that wealth and materialistic possessions would bring them happiness, when all it got was more things to worry about.
Social standards are the principal causes of depression: too overweight, too skinny, too tall, too short, being single, not owning a house, not having a job, not owning a car, not having enough friends, not hanging out enough, not being noticed/praised enough, not smart enough... and the list goes on and on.