“By seeking and blundering we learn.”
~ Johann Wolfgang von Goethe
There’s no such thing as a mistake. Oh, you may look back with regret about something, but those are the very “mistakes” you’ll be sure to not make again.
Chalk everything up to experience and simply strive to be better. It’s now water under the bridge. Let it go and know that this is the best anyone can do.
Live and learn, my friend. That’s what life’s about.