Think on your own.

We are too concerned with what was and what will be.
There is a saying: Yesterday is history, tomorrow is a mystery, but today is a gift.
That is why it is called the present. we must enjoy the present who knows after a few seconds what is going to happen to us. why we are too concern with past which has gone already. Can we there and fix them no we can't.
lets think by our heart and let our worries gone and enjoy the past.