No, I regret nothing, all I regret is having been born, dying is such a long tiresome business I always found.
One of the world's most tiresome questions is what object one would bring to a desert island,because people always answer "a deck of cards" or "Anna Karenina" when the obvious answer is "a well equipped boat and a crew to sail me off the island and back home where I can play all the card games and read all the Russian novels I want.
Having once decided to achieve a certain task, achieve it at all costs of tedium and distaste. The gain in self-confidence of having accomplished a tiresome labor is immense.