Here is the second most popular way to sabotage yourself:

Regret the past. Here's how to view every decision you've ever made: It was right at the time. Here's how to view every path you've ever chosen: It was the best choice at the time. No matter what has happened, you did the very best you could. And so did those who may have let you down. Learn what you can, give what you can, and make a decision to create a better future.

In regretting the past, you spend energy where it can do no good. It is a kind of magical wish–if we regret enough, it will change. Just do it differently the next time. That is all that life can expect of any of us. The same strategy is used with regret as with worry: thought-stopping and thought replacement. “Stop it, don’t go there; you did the best you could. If you could have done better, you would have done better.”