The world does lack empathy and it always will. Unless the condition affects them they usually find it of little interest. I guess when you have something seriously wrong medically it makes it easier to understand others who are suffering is well.
This world is far from perfect and never will be. You are right, you can't win a battle you haven't fought. The world is far from fair as well... But I suppose all we can do is grind on...
It's true, the world lacks empathy, mostly. However, I've been lucky to know some good people in my life, but I've also met terrible people as well. I do think the only way people can actually have empathy is to actually see from the lens you see, if not, the world is indifferent to suffering and pain.
However, there's nothing we can do but keep grinding, hoping and believing. For me, I find my solace in the grace of God and really nothing else.