If you want to wear diapers all the time and use them all the time instead of using the toilet then all you have to do is force yourself to pee in the diaper when you feel the urge.
After a few years of using diapers instead of the toilet all the time I'm now dependant on diapers so I would say I'm diaper dependant now.
I could probably retrain my bladder to use the toilet again if I wanted too but I prefer to use diapers instead and will never use the toilet ever again.
To become diaper dependant I just started wetting the diaper at the first sign of feeling the urge to pee.
So instead of normally holding back the pee until I got to a toilet I would start peeing even when I felt the slightest urge to pee.
It can take awhile to become used to peeing in diapers but eventually you will get to the point where you'll start wetting the diaper without any thought.
Now I cannot go anywhere without wearing diapers because if I did I would wet my pants instead so diapers is it is for me and that's what I prefer.
You might also try hypnosis tapes to start training yourself and your mind to start relaxing your bladder muscles where you'll begin to wet the diaper without thought.
At first you might need to drink more coffee or water or at least increase your fluid intake so you'll have more option to pee.
So just begin peeing in the diaper as soon as you feel the urge and eventually your bladder muscles will be relaxed and then overtime your bladder muscles will be weakened to the point you'll be incontinent and have to be diaper dependant.