On the way to work, I listened to the song “Dear Younger Me,” which beautifully asks: If you could go back, knowing what you know now, what would you tell your younger self? As I listened, I thought about the bits of wisdom and warning I might give my younger, less-wise self. At some point in our lives, most of us have thought about how we might do things differently—if only we could do it all over again.

But the song illustrates that even though our past may fill us with regrets, all our experiences have shaped who we are. We…