Gretchen Rubin’s Happiness Project post hits the nail on the head. The title says it all.
The absolute, #1 secret to adulthood… to not becomming complacent… to continually growing as a person… and just not becoming a dick, is Don’t believe everything you think. (Related: don’t say everything you think.)
Somewhere on the path to becomming a grown-up we put a lot less emphasis on trying new things, being curious, and learning. I guess those are the choices you make when you are “busy”, but they are also a crucial ingredient in figuring out what is actually worth doing.