It is a great realization to know deep within that everything is happening in the now for you. The past, the present, the future… It is all in the now. And we shall come to see there is no need to regret when you can start anew in any moment.
A past choice may have led to an undesirable present, but you can make a choice to shift in accordance and do it differently in its current manifestation. It does not change the past but it does change the present which changes the future.
The only mistake we ultimately make is to not learn from past doings.
And every moment is a chance to apply the lessons learned where the past, present, and future become one. And the future is nothing more than these moments converged.