Regret is only good for about a minute or two, while you’re learning from it.
Then you have to move on.
If you stay stuck on regret, it can lead to all kinds of not fun things like anger, depression, and so on.
Regrets will come up, it’s a fact of life. So, feel it for a second, learn from it, and then move on as a stronger more experienced person.
Stay strong, my friends.