I honestly don't see anything wrong with it in the sense at it isn't hurting anyone. That being said, it's still something that you feel dependent on, and it's never good to feel completely dependent on something if you can help it.

Look inside yourself honestly - do you think there is an issue with what you're doing? Do you want to continue doing it? If you feel good about it and the only thing bothering you is society's view on wearing diapers, then try to take that out of your mind and just do what makes you feel most comfortable.