Do you spend more time thinking about the future or the past? Why?
Worrying about the past is unproductive because you cannot change what has already happened and dwelling on it can negatively impact our present and future by causing unnecessary stress, guilt or regret. It slowly erodes our well being and can leads to anxiety and depression.
Jesus tells us in Matthew 6:34 not to worry about tomorrow, because tomorrow will have enough worries of its own.
I always try to stay focused on the present day and what God is doing right now.
From Pity to Praise 