You know you're addicted to Runescape when you sit at the computer for 6 hours or more a day, on average, you weigh over 300 pounds, you only have a couple of friends and they have the same problem as you, and all you really care about is Runescape. Also, if you use the excuse that you only have no life because you don't need a life to be successful in school, and that you'll get a life when you have a career.
Oh wait, that's me.
Anyway, you know you're addicted to Runescape when you start killing animals outside, then when you're being questioned for animal abuse, you tell them you were trying to get 99 Slayer.