“ When we are children we seldom think of the future. This innocence leaves us free to enjoy ourselves as few adults can. The day we fret about the future is the day we leave our childhood behind. ”
Source: The Name of the Wind
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The trouble is that instead of living only in the present, we try to live in the past and in the future at the same time. 
You spend your whole life stuck in the labyrinth, thinking about how you'll escape one day, and how awesome it will be, and imagining that future keeps you going, but you never do it. You just use the future to escape the present. 
This is what the past is for! Every experience God gives us, every person He puts in our lives is the perfect preparation for the future that only He can see. 
Do not look back, No one knows how the world ever began. Do not fear the future, Nothing lasts forever. If you dwell on the past or future, You will miss the moment. 
If you want to be happy, do not dwell in the past, do not worry about the future, focus on living fully in the present. 