Be yourself, and don't let anyone pressure あなた into doing stupid crap just for the sake of being "cool" and "hip". It's not worth it! Never feel bad for being different または holding onto your innocence. Your life should not be rushed, so please don't get in any hurry to grow up. And if あなた have parents that suck and/or don't care about you, just remember that あなた can always find someone who does.
Now for the spoiled brats:
あなた aren't entitled to crap, and we adults aren't your slaves. あなた want something? Get off your butt and get it YOURSELF. 芝居 like a spoiled brat won't get あなた anything except a butt-whipping. That is all.