I'm fourteen!
You yell this when you're in a pool at Mandalay Bay and you're too cheap to pay for pool access. You're also trying to convince yourself you're still a kid. It works if you're under 18 and not being called out by your mom.
'I'm fourteen!' I shouted, even though I was 17 and my mom was watching me from the lobby.
'I'm fourteen!' I yelled, trying to get out of paying $15 for pool access.
'I'm fourteen!' I said, even though I had a fake ID in my pocket.