Death is really a great blessing for humanity without it there could be no real progress. People who lived for ever would not any hamper and discourage the young, but they would themselves lack sufficient Stimulus to be creative.
What do you first do when you learn to swim? You make mistakes, do you not? And what happens? You make other mistakes, and when you have made all the mistakes you possibly can without drowning - and some of them many times over - what do you find? That you can swim? Well - life is just the same as learning to swim! Do not be afraid of making mistakes, for there is no other way of learning how to live!