Regrets

Just ask: What is the best possible action given my current situation?

Worrying about what could have been possible is suboptimal. The only thing you can do now is take action. Worrying will not change the situation. You could learn from the bad outcomes and make sure not to repeat them. But it is very easy to get drowned in unproductive worrying. It is a simple thought, but it took me a long time to internalize. Do not live in the past. Learn from it. Plan for the future. Focus on the present.

Initially, I wrote a lengthy article with examples and a flow of thoughts. However, I found that this single question was the best way to conclude everything.