Welcome to Less Wrong.
You've given me quite a responsibility here and I'm not sure if I'm qualified as the Less Wrong Ambassador for Smart Teens. This probably deserves a thread of its own.
Anyway, I'll give it my best shot.
The Sequences are often considered the main point of entrance for Less Wrong. I don't quite agree (I wouldn't have read all of that when I was 16, I'm sure), but if you can stomach it: best start reading now. Another point of entry is [Harry Potter and the Methods of Rationality], which is more accessible but the style isn't for everyone. If you read very quickly, you might be able to catch up before the finale.
Here are a couple of Less Wrong posts I'd wish I read when I was about your age:
Alright. That should be enough to get your started for now. I'll think it over more and maybe (but know that I'm extremely prone to procrastination) I'll start a Discussion thread on this sort of introductory material.
The main thing I want you to learn from Less Wrong, to start with, is that you should do more than what is required of you. If you're even slightly intelligent or clever, school will not push you. Your friends will not push you. Your parents will not push you. People will be content with only a bare minimum of your actual capabilities. It's up to you to reach your full potential. Don't count on external sources to do this for you.
Well thank you very much ! And sorry for taking some of your time (to find out which article to give me).
I've got quite a lot of reading now (I figured out already that many articles are wrote in response or in reference to yet an older article that you need to read first, and I started training speed reading for that matter). You don't really have any "responsability", as being on this website was already the right choice for me, and I think I would probably eventually stumble upon those articles that you pointed out (I just feared that, not finding the specific important articles, I'd stop reading Less Wrong out of interest).
I recently had the privilege of a 1-hour speaking slot at SPARC, a yearly two-week camp for top high school math students.
Here's the video: Wisdom for Smart Teens
Instead of picking a single topic, I indulged in a bunch of mini-topics that I feel passionate about: