How to have fun on a cruise as a teenager?

I'll be going on a cruise with my friends (18+) for my high school graduation. More than likely they will want to hang out in the 18+ zones and go clubbing, etc. I am 16 and I would love to do that with them but I doubt I will be able to sneak into the clubs unless I borrow my mom's key card and even then she has short blonde hair and is bigger and curvier than me. I was also thinking of trying to convince my parents to set my birthday as 18 but that also wouldn't work because you need ID to get onto the boat in the first place. So how do I have fun on the cruise still while also not feeling like I'm missing out?
How to have fun on a cruise as a teenager?
Post Opinion