Hello L.A.,
Welcome to TNBW!
You've definitely landed on a good site. Plenty of helpful members. If you decide to become a member after the trial, the costs work this way: Monthly Plan: $8.95 per month. Quarterly Plan: $21.95 per quarter (less than $7.50 per month). Yearly Plan: Only $69.95.
I hadn't shared my work with anyone other than friends and family before joining TNBW. Since I joined three years ago, my writing has continuing to improve. Join groups, respond to forum questions, and above all, read and review other members' works. It all helps to improve your writing. Your writing voice will come and members will help you along the way.
I can't answer about how readers and agents would respond to memoir non-fiction as I only write fiction, but have you thought about using fictional characters and tell your story through your characters? I believe this would still be therapeutic for you and still get your message across. I'm sure there are other members more knowledgeable than me who will chime in. Regards, Randy