Am I Addicted to Gaming?

I've been gaming for about two years now and the time I play is steadily increasing. I play about 2-6 hours a day (CoD4, CS:S, EvE Online) depending on how much is going on. I still do my homework, but I try and get it done as fast as possible and put very little effort in. My grades have slipped only slightly and I still play on a sports team. I've only recently just started neglecting my hobbies and my parents are starting to worry. At this point I do think I might be addicted but I'd like other opinions and maybe some suggestions on how to get rid of the addiction. I've tried quitting but I always just go back because I have nothing fun to fill that 2-6 hour void I created...