No. I tend to do the best I can with what I have and then live with the outcome. I don’t see the point in looking back and saying ‘if only’. I don’t think it’s healthy. Plus, I am an optimist so if a door closes I strongly believe another one will open soon and in my experience, that new door has usually offered me something better than the thing I missed out on.
I look back and see many decisions which, made differently, would have no doubt changed the course of my life—for better or worse. But that’s the unchangable past, and that’s life.