As a kid I was taught by my school teachers

As a kid I was taught by my school teachers - "All things are bright and beautiful",
I used to wonder, "Am I not lucky to come to this world?"

As an adult I was laughed at, for still believing the same,
I wondered, if all those who laughed at me were "sinners"?

As a middle-aged person, I finally laughed at myself, 
I wondered, if I was "led astray" in my childhood by such teachings? 

As I gradually advanced in life, 

I develop some angst against my school teachers,
Should they not have taught me instead "Street Smartness"?