I joined when I was eleven and I managed to do fine. Also, if you want to stay alive any longer, you should stay off the forums and don't publish your storygame unless you learn how grammar and spelling work. People here tend not to be very friendly to little kids who can't even write a sentence without messing up the grammar or spelling, so maybe lay low for a bit.
Read, rate, maybe even comment on storygames for a while. Work on your own game quietly in the background. Read articles on items and look up basic grammar rules. You can ask for spelling and grammar help on your story after you have written a decent amount, and don't just add people to your storygame without asking.
If you don't think you can do some of these things, then maybe this isn't the site for you. There are only about 4ish kids who have actually succeed in not being banned from the site, so maybe it's best if you just try and find a different place to write. Good luck. You'll need it.
Edit: Well, this was wasted. Guess I should know better by now.