"Suddenly, I understood. Those anxieties didn't come from the world around me, but from within."
Uh, no, they come from the world around you. It is possible to keep a positive attitude when life is throwing a ton of stress at you. But that doesn't mean there's no difference between a good and not-very-stressful life and a bad and very-stressful one. There's a big difference. And the system is stacked to hand most of us a lot of the bad stuff. It doesn't have to be that way.