I need help getting abs for next year?

So next school year, in 7th grade, I'm supposed to take a school trip to the nations capital and NYC, and the hotel we'll stay will of course have a pool, but I want to have abs, because a lot of my friends might go, and I don't wanna embarrass myself in front of them. BTW: I am about 5'3", 12 years old, and I'm about 115 pounds ( Is that the normal weight for an 12 year old boy?). Any workouts? I do about 150 crunches every night ( 3 workouts, 50 crunches each), and so far, I have 2 abs at the top under my rib cage. I have a little chub, but not to much. Just enough for a six pack. Please, and thank you for taking your time to answer. P.S Please do not say "Your 12, you shouldn't be worried about abs", because my parents are always telling me I should work out more.