Not sure I completely agree
Dustin said: Think about why people use a planner in the first place. To jot down important events for certain dates. I know I don't need a full-on planner because not a lot goes on for the average eighteen year old. We don't manage our dentist or doctor appointments and such. Our mothers have that job. We jot down test dates, job interviews, the date a movie comes out in theatre, concert dates, etc - basic teen stuff. Older and more socially experienced people have dentist and doctor appointments to worry about and potentially job meetings, when a bill is due to be paid - important adult stuff.
Dustin, you sound like a neat guy. I just want to make one point, though, and that is that you will be managing your own life completely very soon...having a calendar, although you may not use it that much, will sure help you develop the habit of looking at it, writing stuff down, etc. before you really have to be solely responsible for where you go and when. Might be fun for you to make your own, though, with graphics and stuff that appeals to you. I know many school districts around the country start in middle school with planners for their students every year, but I know I would have been considered the ultimate nerd if I'd carried one around :-} I think it's great that you are at least thinking in terms of GTD...just might want to consider actually acting on some of the recommendations you've read about. I think you'll find it's a good investment of your time and you'll have less stress when you start college. Cutting down on college stress will help you enjoy what will be the VERY BEST time of your life!! Good luck!