Hey Timelinex,
Hopefully you're dosing creatine monohydrate at 5g/day (not 5mg), but lack of water weight doesn't necessarily mean you're a non responder. Non responders are fairly common. Things that predispose to it are high initial levels of creatine in the muscle, low levels of fat free mass, and low levels of type II fibers as compared to responders. I would keep taking it though regardless.