It may have changed your life, but for the better? Look at those you aspire to live like... if you knew what was under their hood, you may not like it any more... in fact there is a 50/50 chance it would be worse.
What if you decided to make that interview or that journey or that whatever and you were befallen by tragedy en-route?
The hardest thing is to appreciate where you are now and constantly refine that appreciation.
I appreciate that I did not wake up this morning with a chalk line around my body... it is a good day!