Dear Mal,
You don't know me (but I know you a bit more than I really want to in all honesty), heed my words of wisdom or I shall hunt you down and publicly humiliate you in front of a certain someone (you know who I'm talking about).
Firstly, save yourself a small fortune and DON'T buy the following games (you won't like them, trust me, I know): F.E.A.R, The Orange Box, Warhammer 40k: Soulstorm, Alien Resurection, Fable II, Fallout 3 and Oblivion (you shall be over £100 richer and won't have to waste several hours finding out that , from your perspective anyway, these games suck).
Next, don't worry if the girls at school don't like you, you'll have plenty to look foward to at college (especially in Psychology, you'll see). While on the topic of college, don't bother turning up to employment skills (there really is no point) and for the love of God, stay away from the library (you don't want to know).
Since I'm begining to ramble (and I'm certain that my fellow Escapists couldn't care less, you'll learn about them in due time) I shall wrap this up and let you go about becoming me (in case you hadn;t gathered, I'm you from the future, don't ask how that works because I don't really know).
Yours Sincerely,
Mal
PS: Don't get too excited about your 15th birthday, it sucked (sorry to be a killjoy).