I can't say that I feel my past accomplishments bring me pain, each was as well done as I knew how, and brought me new knowledge, which is quite rewarding. The bar doesn't raise beyond reach either, as you already know how to go as far as you have, and you've hopefully learnt a little more. You're not always going to achieve your best results, but that's where critiquing your performance comes in. You can inevitably learn something from it.