Mortality and immortality

Once you really know one you can't forgive the other.
I've been acutely aware of my mortality for most of my life, which seems to breed a sense of immortality.
How do I keep sane?
Worry.
Over think.
Stress.
About things that matter but not as much as my mortality.
Or as much, because I give them that value.
Working with children helps because, as Whitney Houston said... They are our future.