Child.

You young, naive you. I am so jealous of your life. Right now, at your age, I bet you just want to be a big kid. So you can sit at the grown up table on holidays. So you can walk across the street without holding Mommy's hand, but above all of those things, I would wager that you just want to be treated like an adult. I know this, because I felt the exact same way, years ago.
But you want to know a secret? Being a "Grown Up" isn't all it's cracked up to be. It's filled to the rim with expectations, pressure, jealousy, and && just downright pain. Now, let me add on to that. Just because all of these feelings are still constantly surrounding you, doesn't mean there's no room for Happiness. For Laughter. For Memories. For Love.
So treasure your time in that small frame. Do everything you should do as a child. Don't take it for granted, cherish every second. Immaturity is not defined by age, but attitude.
I know you will most likely not understand this right now, but do me favor. Take this paper, fold it up, and keep it safe. && one day when you're feeling the same as I described before, you can take out that old tattered note, and read it once again. Even though by then it will be too late, this will hopefully bring you comfort and understanding. That just because we're not the age of a child, doesn't mean we can't have the atittude of one.