Some of mine are: reading 52 books, going for a walk at least once a week, getting a new piercing, and doing my budgeting every week instead of waiting multiple weeks, etc etc
What's everyone else's? Maybe comrades with similar goals can be accountability buddies 
also stop mourning my childhood essentially. It's over. Time to make the most of adulthood.
I feel this, but remember - adulthood is what you make it. You will never have endless free time again, but you can bring some of your favorite hobbies from childhood into your adulthood. I feel like that fills the void for me. Good luck!