Back To The Future?

Hindsight is human nature but we'd drive ourselves crazy if we spent too much time in 'if only' land.

I've reached a point in my life where (thankfully) I can look back at bad decisions, or missed opportunities and say 'that's the past, what have you learned from that?' 

 Have you seen The Butterfly Effect movies? Characters
travel back in time to change  decisions, actions, that they