I don't know why I keep on thinking every second. It turn out that thinking occupied me, overwhelm me and subotage me. I can not focus on practical, productive life becuase my thought lead me to something uncertainty, nothing is 100% sure, error can occur any part in any situation.
Now I become pretending smile while my thinking parallely feeling so insecure. I have strongly believe that nothing is certain and I can not expect from the others.
This thought occurring all day round, every days, every moments.