Well, you’d be one of the very few stutterers that I’ve seen on here who do not cite blocking as “I know I’m gonna stutter bad, so I try to say it without stuttering but I can’t”. You don’t have a repetitive stutter? So, what happens when you attempt to utter the words? If nothing comes out(not even a repetition) then I doubt you even meet the requirements to have Child-Onset Fluency Disorder. Maybe you have another very similar speech disorder?