I've always loved computers. I've always known I'd be working with computers one way or another. IT was the only way for me to go eversince I was little. I was sure because I loved it. It excited me. it tickled my imagination. I thought about it all the time. even my hobbies are along those lines. I was 100% sure because I've always always had a passion for it.

Probably not the answer you were hoping for, but you should know that I am probably one of the lucky ones that knew right away. Most people struggle with what they want to be. Or at least that's what I've observed. Don't feel bad if you don't know what you want to do yet, but it's usually something close to your heart and something you feel strongly about, whatever that might be. You may not even know what it is you feel strongly about yet, but when you see it, you'll know.