"Starcraft Ghost won't come out.
Sega won't make a sequel to shining force until 2009 for the DS.
Don't bother buying a gamecube, it'll be fucking pointless when you do.
Play tribes more.
Don't give up on the starcraft scene. Don't quit because when you come back you won't know any of the new stratgeies and you'll feel like the laughing stock of USEast, because it will have improved in a few years.
Don't bother with her, she's not worth it and will do nothing but waste your time and draw it away from things that actually make you happy and are productive.
Pick up a guitar NOW, don't wait until you're 17. You'll be that much better. Keep teaching yourself because it's probably the best learning you can have for it.
Ask mom to teach you piano, because you'll start hearing music that you'll want to play, and you won't be able to because you screwed around with it in the wrong way, so stop teaching yourself and let her do it the right way.
Don't buy Deus Ex: The Invisible War.
Treat your mom better, god damn. Don't be such a selfish piece of garbage. At least mow the lawn and shovel the driveway.
Don't go to 4chan.
Don't go into CIT networking, stay in computer science, you'll probably enjoy it more.
Register for classes a long time beforehand. Get the books online, get the ISBN numbers a while before hand. It will save you money, time, and frustration.
Write your graduation cards on time. People give a shit about it. I know you don't, but some people do.
Act with a bit more confidence. You'll meet better people than the bastards that stole your UT2K4 disk for weed money.
Don't take things too seriously. Most of it doesn't matter. You'll understand how little it all means later. Don't hold grudges, it's not worth it."
That pretty much covers the things I'm thinking of right now.