“I am a champion”

Katy Perry – Roar Lyrics on LyricsMode
It means you can do anything and you have confidence. This is an empowering song over women. Men think that they are stronger than women but in the music video a woman is surviving in the jungle. She also is stronger than the lion.
This means that she's not going to be a shy person anymore. So she's going to be out-going and confident. And that she can anything that anyone else can do. And she is not going to let anything bring her down. I like this part because it shows that she has confidence.