Hi @looftee hope you are well.
I don't understand the word "delusional" here:
People who achieve success are delusional, but realistic. The right amount of delusion can help you achieve all your dreams. Being delusional means you are above average and everyone around you feels that you are unrealistic.
characterized by or holding idiosyncratic beliefs or impressions that are contradicted by reality or rational argument, typically as a symptom of mental disorder.
"hospitalization for schizophrenia and delusional paranoia"
based on or having faulty judgement; mistaken.
"their delusional belief in the project's merits never wavers"
Sorry, but I don't understand...
I agree that self-talk is important
need to have lots of repetition of self talk. Positive self talk, to build your inner confidence. To make your core strong.
As a Christian we use bible verses in our self-talk e.g. I can do all things through Christ which strengthens me.
Thank you for writing.
If you have time check this out, just want to share with you.