Looking at life through a rearview mirror can be good in many ways, keeps you reminded of the wrong choices you made to keep you focused on making right choices in the future.
When it becomes a problem, is when you keep making the wrong choices over and over, repeating the same mistakes; till you get back on right track. Many have had had to hit rock bottom to figure all this out.
All in all, life is good and its what you make of it. You can become mad at the whole world, focusing on all the negativity in the world or you can choose to look ahead to the future with a smile, finding good people to associate with to enjoy good times together and to see the joy of things God has put here on this beautiful earth.
Take the time to smell the roses !!