Almost any form of advice which begins with "just" is usually trying to wave away real problems. Go on, try it. Instead of "build a rocketship to go to the moon," do "Just build a rocketship to go to the moon." Sounds a lot easier that way, doesn't it?

But all of the self-improvement stuff doesn't help if you, say, have Goldenhar Syndrome, or a major handicap, or perhaps you have some very unfortunate facial features, or you have to care for an elderly parent, or any number of things.

It isn't always as simple as "people who haven't been trying hard enough."