Dreamer, I was so sorry to read your answer. Yes, if only we could do over some of the things we had no power to change.
But...
Imagine yourself several years from now, looking back on this day. Is there anything you can do over now, so that on that future day, you will be happier with yourself and your life?
All we can do is go forward. But the nice thing is, you get to work at more than one do-over. (And me, too - I need to keep this in mind for myself, too.)