Admitting you used to be wrong about something is proof you grew. Nothing to hide there.

Beliefs you have dropped are evidence that you have been paying attention since. People treat them as something to bury, when they are the clearest proof available that your mind can still take in new information. The only people with nothing to revise are the ones who stopped checking.

Think of something you believed two years ago and no longer do, and say it out loud to somebody without the defensive wrapping. Notice that nothing happens. The ease of that is worth remembering next time you are tempted to stay with a position you have already stopped believing.