This is a really interesting post, thanks OP.
I am wondering if there is a name for what I go through.
My current psychiatrist speculates autism and SPD but we have just found out that I have epilepsy, so we are still trying to put the puzzle pieces together.
I am not sure if I'm just socially inept, shy, selectively mute, or just a bit odd. But I am silent almost 95% of my life. I can respond to people such are my parents and my professors but what I want to say almost never comes out. My responses are very very short. I carry better conversation with my doctors than anyone else because what they do intrigues me to no end. (I want to go into medicine, myself.) Teachers have always noticed I was very very very quiet and have even given me lower scores for it but no one ever suggested that I might need help with it.