I was selectively mute until my early twenties and still somewhat now. I was always chatty with my parents and friends, but never spoke in class or in certain situations. Even in my first permanent job, I only spoke to a few people. I would speak for long periods wth the guy back to back with me, but few others and none like that. I smiled, said 'Hello', was polite to the others and answered questions, but never actually started the conversation. Even today, I don't speak at all at the parents council meetings, at my daughter's school. I'm only there to listen. I'd like to be able to speak up, but I've gotten 'stage fright'. I've realised that I could probably speak, if there was a table and the numbers were much fewer. But, there's about 25, all sitting in a circle (kind of). I know I'd turn a lovely shade of crimson, no matter what I said. Maybe some day.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley