Guess what? Everybody burns out. It's completely unavoidable.
It doesn't matter what it is that you do, you may be a programmer,
a construction worker, an avid recreational cyclist, or even an
everything editor--regardless, you will burn out. You'll eventually
discover that you no longer get the joy from the activity that
you used to. You'll ultimately find that the little things that used
to be charming are now simply irritating.
It doesn't have to be this way.
Embrace the changes in yourself. Accept that you will always be
growing, morphing, constantly re-inventing yourself in new ways.
Nurture the fact that you, today, are nothing but a
seed that will grow into a greater and more interesting you tomorrow.
Recognize that nobody ever feels like they, themselves,
have grown up. They haven't, and neither have you. Nobody stops growing
up until the day they die.
Don't call it burnout. Call it the point in continuing on.