I talk averagely, except in social situations where I don't know anybody. I go completely mute.
It's sometimes embarrassing really, because once when I had a garden party in my garden with lots of relatives and other people I didn't know, and I sat yapping away to my auntie and mum and brother, then as soon as the party guests started to arrive, I shut up completely, like I immediately switched personalities. My brother then commented on it later. He was like, ''switch on your loud personality! The quiet one is boring!'' And I did not know what to say.
I'm sure my brain changes itself, depending on the environment I'm in! 
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Female