The Idiom Attic - a collection of hundreds of English idioms, each one explained.
The meaning of "the author of your own misfortune"
" The author of your own misfortune "
Meaning:
Be to blame for one's own problems.
Example:
Tommy just took off across the moors with no gear and no phone. He ended up in hospital but no one is too sorry for him - he was the author of his own misfortune.