When I first started off, I had very limited access; per day, my parents would only allow me to use computer for only an hour. During weekends, it would be two. I used to spend most of my time playing games online, and sometimes offline when connection winds up to be too slow. I also used to get homework help from certain sites on Internet from time to time; they were pretty informative!
After my dad bought me my own computer on my twelfth birthday (or was it thirteen?), luckily, I didn't have any restrictions any longer, and was able to surf web as much as I liked. One day, I began searching for Action Replay codes for a game I was playing, which led me to some message board; I've signed up, began posting, and before I even knew it, I became addicted.
Ever since I discovered how fun it could be to hang around in forums and whatnot, I... couldn't stop myself from constantly going online, haha. I find it amusing to be meeting people who share similar interests as you (Pokémon, for example), making friends, possibly learning things; it's an adventure of sorts, so to speak. Only negative side is, sometimes, Internet could distract you from doing certain work, such as studying for exam. If we could control ourselves from being distracted by it, however, then it's not so bad.