Am I Showing Humility, or Admitting My Cruelty?

Never listen to what I say;
I'm a lying, cheating fool!
Don't ever trust my heart to stay;
it wavers, like the light of the moon.
When I say "Oh, I'm alright,"
I'm lying, but please don't ask
why I'm not, or why I lie.
If I wanted you to,
you would see through my mask.