Oh, I forgot to mention: you don't have to know what you want to be. Most people don't until their senior year (many even into college.)

I myself had the dream of being an interior designer since 8th grade. I worked my butt off in school and in a job so that I could afford to go to the college I wanted. So I graduated with this dream diploma, worked nearly ten years as an interior designer. You know what? I HATE it. No amount of money will ever convince me to go back to it. I'll help out friends and family - and love that... because its the "fun" part of being a designer. I refuse to work full time at it for Mr & Mrs don't-know-what-they-want-but-it-better-be-cheap.

The moral of my story is, no matter how early or late you decide what you want to do doesn't matter because eventually you'll end up doing what you love. Most peole I know start out in one major or career and then change mid-stream. My husband was an accountant and is now a history teacher. My kids will announce that they want to be a teacher, then its an X-ray tech, then its a park ranger. Thing is that you can imagine yourself in all of these jobs without commiting yourself to them at all. Thats the fun part of being young.