Something I wrote as advice about two years ago. Thinking about it now; maybe worth sharing to a wider audience:
You can regret, and still build from where you are. Regret is not the end. It puts you in a place. But that place says “the past is what it is.” It cannot be changed. All we can control is the future. The best regret can do is help us make better decisions in the future. And those decisions have to start from where you are, not where you wish you had been.