Predestination, the granddaddy of all paradoxes. Where every decision you make was always going to be a mistake anyway.
Imagine you're at a crossroads, and you choose the road to the left. But, in fact, you didn't choose it, you always had to choose it. Because, in a predetermined timeline, you were always going to choose it.
It's like your choices were made by a giant, invisible, sadist of a librarian, who's always one step ahead of you. And you can't even get a decent book recommendation out of the deal.
You see, in the predestined multiverse, every decision you make is a closed timelike curve. A loop of regret, with no escape.