Self-delusion is the biggest mental block to our full and honest awareness. All of us delude ourselves about reality to some extent; it is nothing to be ashamed of. However, self-deception has many negative consequences for our growth as individuals, and we must identify what it is about our lives that we have chosen to blind ourselves to, in order to avoid ignoring opportunities to work on our flaws.
We know self-delusion is at play if we recognize defense mechanisms, which develop to protect our ego from uncomfortable truths. Nobody can tackle our defense mechanisms but us. There are many common mechanisms such as denial, repression, regression, projection, displacement, etc. Each can be identified through its own unique indicators, but the thing unifying them all is that they allow us to stay in a comfortable bubble where we can get away with not challenging ourselves enough to experience substantial growth.