I've been listening to the Book, “The Subtle Art of Not Giving a F*ck by Mark Manson. It's an interesting book (get it on Audible.com)
Here are some key points:
1. You only have so much capacity to care without stressing out. Pick what you care about and apply it to those things that matter.
2. While things in your life may not be your fault, it is your responsibility to do the right thing. For example, what if someone put a baby outside your door. It's not your fault, but it's up to you to do the right thing.
3. Comparing your life to others can suck all the joy out of your life.