Ever thought of writing an alternate Diary when things are bad?

So things are bad. You didn’t get the job you wanted, you turned down a good offer like a PhD studentship. Maybe a relationship with your partner fell apart or a holiday turned out to be awful. Maybe just about everything goes wrong…..
How about writing a day to day diary of what your life would be like had the bad things or bad choices not been made? Where you’d be today, what you’d be doing. What would have happened. Of course even if everything did go your way, you’d have to be realistic in your diary, there would be set backs, but nothing as bad as in the real life diary.

Isn’t that just slow torture? Surely it would make more sense to accept that what cannot be simply cannot be but to learn why you shot yourself in the foot and resolve never to do so again?
If wishes were horses, beggars would ride, my grandmother used to say, the Germans have:
Wenn das Wörtchen wenn nicht wär, wär mein Vater Millionär
So at least two cultures have proverbs warning that “if onlies” are either absurd or pointless. I’m not sure there's any good in raking over alternative pathways the past could have taken. Accept and learn but carry on is my view.