When I first read this way back when, I thought "oh god this is not gonna end well, but there isnt really anything anyone can do about it"
Now that I think about it though, this really isnt normal. Im not talking about doing this sort of stuff. Of course thats not normal. Its the part where you said
> I am usually very verbally when I masturbate so I normally have to scream and yell about diapers and pee and poop when I do it.
What stood out to me is the way you said "I normally HAVE to. Like you are compelled, or simply cant get off otherwise. Whatever your thing is, it shouldnt be that hard to get off. This indicates to me that your issue might not just be... whatever this all is, but rather a symptom of some other issue. Like, you may have been driven to your current state because there was no other way to satisfy yourself due to some other issue. If you solve that other issue, the rest of this wont be necessary.
Seriously, find a doctor. You are protected by nondisclosure, as long as you dont have any desire or indication of hurting yourself or others. Get help, solve the problem, before the problem solves you.