Entire holy Pesukim are spent about the episode of Moshe being upset with Ahron for not eating the Korban. In the end, Ahron explains himself, and Moshe admits his mistake without: בוּ שָׁ ה embarrassment. (Rashi). What an important lesson! When you make a fool of yourself, complaining and making scene in public, and later you were proven to be off the wall and completely wrong; how do you feel?
You are full of shame and remorse, and loaded with depression. “What a fool I made of myself”? And Moshe is just the opposite. He admits his wrong right away (without arguing) which is tremendous Gevura. And he has no: בוּשָׁ ה embarrassment. He moves on as if nothing happened. I would suggest that Moshe valued every move he made, even his mistakes, since he was L'shem Shamayim. No wonder he was so great!
Chazal say רְ שָׁעִים מְלֵּאִים חַרָטוֹת “Reshaim” are full of regret. Although regrets can be a big Ma'ala, they can also destroy a person and his future productivity. I have heard stories of Baalei Mussar who after making the worst mistakes continued without getting all Tzu’tumult (confused). It might be K'dai (worthwhile) to make up your mind: “I am not a sensitive person”. “You can call me the worst names, and I can make the worst mistakes, even terrible sins, Chas V’shalom. I’m not impressed! I just do Teshuva and keep going!”
