I am the Stalin of my mind

When I was young I told the truth
just as I saw it, in a fine tale;
that was an error of my youth
and now against it I shall rail.
Now I'm real famous, and my words
carry more weight than once they did,
so I must challenge those bright birds
who will not do just as I bid;
I alone may say just what I mean,
all others must to me give way.
I am the master of this scene,
I'm the sole author of this play.
Now as my glory seems away to fly
I'll try to save it with a blatant lie.