Being happy with what you have is a state of mind, and a rare one at that. Try to appreciate all the things we take for granted on a daily basis — the ability to walk, the ability to eat, the freedom to live our lives, having a roof over your head, etc.
Rule #1: Be happy with what you have.
Can things be better? Sure. And I’ll get to that in rule #2. But have you thought about how it could be worse? For everyone who is skinnier, healthier or richer than you, there are many more who are on the other end of the spectrum. Appreciate what you have, and you’ll find life is more enjoyable.