You should never regret what you have done.
Life experience - it is not gained theoretically, it comes only with practice. With actions, their consequences, conclusions drawn from the past. You can't learn how to cook scrambled eggs without breaking eggs. And life, in general, will be more difficult than scrambled eggs ...

There are no right or wrong decisions. If you do something, then you understand that now this is the only right way out. You are the current one, with all your experience, views, attitudes and emotions, you don’t see another. So do it! And to figure out whether they did the right thing or not, it will be possible only later, after.

Regret poisons our lives! Yes, it is often possible to fix something. Try to reduce the damage, if any, to understand what was wrong and where, to realize how and where exactly it was not necessary. But over and over again in my head to scroll "But if ..." and "Why am I such a fool? ...." - Is there any reason? Selfishness is the worst waste of time.
None of us are perfect. Nobody is immune from mistakes. Life is not a black and white chessboard, it is colored, it is more complicated than the “yes-no” scheme, it is impossible to foresee everything ... well, except to do nothing at all.

Yes, you can hang like a fly in amber, afraid to take a step. But... there is nothing in this white sterile void! And remaining in it because of the fear of making a mistake, we ourselves will turn into nothing.
And that means we will live! Act, go, fall and rise! And we will definitely come somewhere.
It simply cannot be otherwise!
Good luck to you all, my dear! And may your path be smooth and without regrets!❤️❤️❤️