We Can’t Change the Past
Almost every one of us has regrets about something in our past, but there is nothing we can do to change it. Instead of wasting our moments and energy in lament over situations that are long gone and no longer in our control to change, we can use the energy to make our present situation better. Learn what you can from the past, and then move on.
We Can’t Predict What the Future Holds
Don’t worry about the future, that is in God's hands.
The heart of man plans his way, but the Lord establishes his steps. (Proverbs 16:9)
You can only prepare to a certain extent, and being fearful about what tomorrow holds will only cause stress that will contribute to health and mental problems. If you have hope for the future you can live in the moment and choose to make the present your focus. Indeed concentrating on accomplishing what you can right now will make your future plans and dreams more likely to be fulfilled.
...seek first the kingdom of God and his righteousness, and all these things will be added to you. (Matthew 6:33)
Instead of fearing what repercussions your choices will bring to your future, make decisions, based on what is good and right. And the joy and fulfilment and happiness will follow as sure as day follows night.