I've heard so many quotes that literally tell us to forget about the past and move on, living life in present time. But in my opinion if we occasionally do not go mentally back in the past, we forget the things we loved to do, the aromas we smelled, the people we used to meet... and so so so much more. Those things in the past made who we are now. So if we stop thinking about the past, we are most likely forget who we really are. Sometimes a look back into the past, may change the decisions you make today.
Just like in the photo above, all you see is what's in front of you, BUT do not be afraid and - look back, because this might be one of the best turns of your life.