"Let go of regret and let go of self reproach. Say sometimes in your prayer: "Yes, great Father of All, I have failed in this. I should have done better. Help me next time to fulfill this with a greater understanding." Do not weep over your failure and reproach yourself endlessly, for you only build a barrier which holds you back from Light and comfort."
For me all the regrets were excess baggage i carried for a long time...I am traveling a lot lighter today.