Hey, I think in a way, I share a part of the problem you have, thought not in such a large extent.
To me, at least, what annoys me the most is the sentence "Enjoy being a kid while you are one, you won't be able to when you grow up". Yes, because we can naturally dumb-down ourselves to be around the idiocy shared by some people of our age group. Some of it may also be restrained by the freedom we have; or lack thereof. While when we are mature, we are expected to behave that way (especially in cases like mine where we look like we're 3 years older) but the restrains are still there, and even though the maturity to handle the exam grades/studying for them, people like your parents will still see it as their job, and it will unfortunately remain that way until you go to college, and there's little to none you can do about it.
One thing "older members" like Sci-Fi and maybe even IgnoredOne (I'm just taking names off this thread, so obviously really huge amount of people is missing) may remember, is that when I first signed up here, I claimed I was 15. While that may not seem that big of a stretch from 13 (was 12 at the time), I was sick of being treated like a child by everyone else, so I tried using it as a refuge, cause if I was going to talk to smart/lonely people in here, I really didn't want them to overlook my opinions because of it. I also write a lot, normally over 5000 words per week, and it happened in the place I write to - and it happened there, so I really couldn't take the risk of it repeating here (that and because I'm portuguese, but that's a different story)
What you have to remember though, is if it is purposely to pick on you, then anything will go. When trying to hurt someone verbally, most use both their flaws and positives against themselves.
(would write more, tbh, but can't because it's ******* 11PM and my laptop is being literally taken off my hands. Good luck, I guess)