You never have to share it with anyone if you don't want to, but get it on paper.
I have written extensively over the years about my experiences raising an autistic son. It helps me explore the facts of the situation as well as the emotions. Sometimes I put it into a blog, but usually, it just sits on my computer.
I've also recently taken to writing about being raped when I was a sophomore in college. I always find the essays too personal to share - even with my husband, but getting the words out is theraputic. It's almost as if by the act of putting the words on paper, the burden is diminished - even if no one ever reads those words but me.
I do find that both of these exercises help me get in touch with my fictional characters. I can inform their past with my own experiences.
I say, if it's what's in your head, and it's what you feel driven to write about, then write. No harm can come from putting the words on paper. Once you've gotten it down you can choose how or whether to share it with anyone. Until you've written it, though, you don't have that choice. You have to hold it all yourself.
"If you can't do something smart, do something right." --