unstoppable song meaning

I put my armor on, show you how strong I am. yummy justin bieber meaning I put my armor on, I'll show you that I am [Chorus: Sia] I'm unstoppable, I'm a Porsche with no brakes I'm invincible, yeah, I win every single game I'm so powerful, I don't need batteries to play I'm so confident, yeah, I'm unstoppable today