Loss is a universal experience that affects us all differently. It can be the loss of physical or mental ability, of freedom, people in your life, or of opportunity or possessions.
I can imagine that you have encountered your fair share of loss, and I admire your resilience in the face of it. The way you have learned to appreciate what you have and not take things for granted is truly inspiring.
Life teaches you to appreciate what you have, or can humble you in many ways. The sooner you learn this lesson, the better for you. I'm speaking from experience.