I wholeheartedly see you as a writer. I've witnessed and taken note of your progress and admire the personal nuance you share in your stories.
I get FB. My experience is the same. I started posting my notes and a few stories. I started a page for people to share their talent. All that effort had some sparse response but nowhere near what we do here.
BTW, hardly a day goes by that I don't resign myself to writing on Medium by saying Heck if you are so unsure of yourself, but you don't want to quit, then you'd best be vulnerable.