Honestly? No. Not really. If I keeled over right this second, I would die content that I had lived a good life, if shorter than I'd like, and was a good person. I'd die knowing that I had good friends, a good family, and hoping that I had improved someone else's life during my time. Regrets? Sure, but everyone has regrets of some sort. Mine are of the minor variety, along the lines of "I wish I could have done ___ too" instead of "I wish I could have done ___ instead", which means I'm not restricted by what I didn't do, I'm restricted by what I couldn't do, which is a big difference in my book.