A correction of the common adage to "look like a girl, think like a man/boss." This gives ANYONE the freedom to do what THEY want, throwing gender roles aside. The original post is problematic, from the word girl to man.
Give yourself a break. Stop beating yourself up! Everyone makes mistakes, has setbacks and failures. You don't come with a book on how to get it right all the time. You will fail sometimes, not because you planned to, but simply because you're human.