Leave ~insert name here whom I'm not willing to put~
Be confident
Or
Believe yourself
Or
Exercise more
It's not two words but I would tell myself "You listen with your ears, NOT your mouth." or "The best way to save face is to keep the lower half shut."
Don't expect people to live up to your expectations and don't try to live up to other peoples expectations.
The same for me but with more emphasis.
"Pay attention you dumb little shit. Listen more than talk and get your head out of your ass."
Maybe that would get my attention. I would need to do that somewhere around 13 though.