I can relate to this.
The sad irony of course is that I’m in a cafe doing this, instead of in the home office with the door closed. I can’t help it, I either need to be completely isolated or be surrounded by people who aren’t entitled to one iota of my time and attention.
I’m not so sure the solitude has to do with my particular drive to write. My drive comes from the struggle to take ideas from my head, some that’ve been there for years, and spit them out in a form others might appreciate. I’ve been doing the spitting part for years, anyway–why not construct something from it?