When I first heard myself on tape, I definitely noticed something weird with my voice. My voice sounded like bad voice acting. Even if I was genuinely excited or whatever, I sounded fake and emotionless. It was deeper than I expected. The rhythm of my words was also … somewhat off. But I assumed that’s just because your voice sounds different to yourself. I thought that everyone had this experience with their own voice. Nobody complained about it, so I didn’t let it bother me either.
It wasn't until after I met a confirmed autistic who spoke similarly and read about monotone voice did I realise it's not all in my head. But I never became self conscious or anything.
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Life ... that's what leaves the mess. Mad people everywhere.