You can't learn to act unless you're criticized. If you tie that criticism to your childhood insecurities you'll have a terrible time. Instead, you must take criticism objectively, pertaining it only to the work being done.
The text is your greatest enemy.
Acting is fun. Don't let that get around.
Acting is behaving truthfully under imaginary circumstances.
Acting is the ability to live truthfully under the given imaginary circumstances
Find in yourself those human things which are universal.