Obviously fading is the best way to go. Moving out would probably be the best bet there. I left at the same time as you, I was almost 20 at the time. I was going to Community College and I was really just sick of everything that was happening in my congreagation and honestly I was just sick of being a witness, I never really believed that they were "God's Channel" or anything. So I got in a debate with my mother about it. I told her that I was racked with guilt and so forth, that I was having severe emotional problems because I had doubts about the orginization and it was just too much between school, work, meetings, service and so forth. I basically made it seem that I couldn't take being a witness anymore and if I was a witness anymore I'd probably end up killing myself. (Which wasn't true at all, I was just really annoyed). I was somewhat depressed but I amplified it, until my mother said that she'd rather see me not go to meetings for a while (she was confident I'd return) with the hope of returning, than killing myself and not only not returning but not be resurrected either.
So if you want you can try that attempt, but you have to be at least a little depressed in order to pull it off because you just amplify the feelings. Though the more I read about depression the more I believe I really was depressed. But hey it's worth a shot, if you're willing.