If you have always done your best in any given circumstance, with the tools that you had at that time, then you should not reproach yourself and harshly judge your choices or actions.
We are all a work in progress and regret is only a sign that you wish you’d done better at the time. That time is gone. Make amends if you feel it necessary and be grateful for all the lessons that you’ve learned, which have shaped you into the person that you are today.
Be equally grateful for the storms and gentle breezes; both are required to reveal the sculpture within the stone.