What are some good songs about speaking your mind?

I might enter my talent show next year. I wanna be prepared & have a song that's about speaking my mind & speaking out. it has to be appropriate & not cuss. I have 2 suggestions & that's Strip Me- Natasha Bedingfield or BreakAway- Kelly Clarkson. I'd prefer a female artist but I could sing a band too. I just want something with a message about being yourself & doing what's best for you & having a voice. Please help! I've looked everywhere! Thank you!!! (: