I think it started wayyy back in elementary school for me. I had a very strict home-room teacher who'd go ballistic over anyone talking in her class, so I developed this habit of not talking at all, and ignoring my friends who tried to talk to me.. all the others kept on talking in secret, but I was too afraid so I went for the easy route and kept my mouth shut. This went on for a few years, and I think that's when I started to stutter. While others were practising speech, I was stuck being the "good boy" who never uttered a single word without raising my hand. I could be exaggerating it, but that's the only thing that I think might've caused this whole stuttering issue.. I'm currently 20 and in college, but I still have some mild stuttering here and there out of self-imposed toxic politeness lol