It sounds strange, I can write in a busy cafe/restaurant, but after any gathering of more then 6-8 people at a time, I need my downtime. I call it people overload.
Growing up I was painfully shy and I didn't grow out of that until my early 30's. Then a corporate career taught me how to smile and mingle, although I still hate small talk and don't think I'm very good at it. Although I admit, living in Ecuador helps - perfect conversation starter.
A writing friend recently posted a funny t-shirt on Facebook and when I went to the company's website, I found several more. Know anyone who might enjoy these? The first one is the one I want!! PS. They have the sayings on tote bags, pillows and more, not just shirts.
Of course ALL writers should have this one!