I Mercury i - You're so full of yourself you think you're the main charact

You're so full of yourself you think you're the main character of the internet and everyone else is just a sidekick.

I Mercury i because I posted a photo and you posted a caption and that's not even close.

I Mercury i because I got 10 likes and you got 1 and that's a disgrace.

I Mercury i because I'm the star and you're just the audience.