I agree with Freta, it's all in the mind.
When I started wearing diapers, it was very difficult for me to pee, I practically had to force myself. Now I wet almost automatically, without thinking abou it or any prior warnings. It just happens.
But when I'm out of diapers, I never leak a drop and my body works just like any normal person. I simply trained myself to have what I call a "diaper reflex", which is basically switching off bladder control when I'm diapered.