I want to be a child

To be carefee
without a single thought of
   T o m o r r o w
     without a single thought of
        S o r r ow

And with no reason to be happy
because no one can take it away from me.

But there's this reason, the unexpected truth.

The error in the program
The lesson I cannot learn
The points on my circle
The turn in every road
The person I can't forget
The reasons are

Y O U.