Unless we decide to share it, but even then our past is a one-sided version of what happened. When you grow up, friends from childhood have a basic understanding of who you are.
However, when you grow up and move away, you get to start over, for better or worse. If we were more honest about our past, we would see that we all are more alike than we could ever imagine because many of us faced the same discrimination and bullying.
At the very least we shared the same big secret.