The best way to become happier and live more carefree:

Lower your standard of living.

For example:

1. I only eat cheap industrial meats — 99 cents a pound for pork, $1 a pound for chicken, $2.99 a pound for beef. Only shop at “ghetto” or “poor people” grocery stores.
2. Prefer to look or seem poor, than to seem rich (and actually be cash poor in reality).