This is probably the most meaningful question someone can ask in life. It is a shame not many ask it. I found myself at this question on my way to college at the age of 17, and it took me a year after that to really find what I believe to be the most value I can add.
This question is truly at the heart of every purpose driven individual.
Thanks for writing such a great piece, and I hope you can continue to inspire many through the creative tool of writing.