Sure, we have all had advantages in life, but we have all had problems as well. Rich people have problems just as much as poor people. Rich people problems are much different than poor people ones, but they are still there.
Too, I think that American culture tends to create the illusion that if you are not super successful, then you are a loser.
I think this especially applies to middle class and upper middle class people.
For whatever reason, our culture has cultivated this cult of success and it just drives people crazy, and sadly, to depression and suicide.
We have deluded ourselves into thinking that more success and more money will somehow result in a lot less suffering. Then, when we taste success or money, we realize that it has very little to do with happiness or suffering.
I know a lot of successful people who hate their lives and other people who are not "successful" that are much more satisfied with their lives.