Hi Jennifer and welcome.
Its good to see another new member here (as I am pretty new myself).
I know what you mean about uploading your first piece of work. It is quite scary, but people here are very kind.
As to the work being autobiographical, I see your reluctance.
You can upload your work to one group only (although I think here it would still be available in your profile for WW members to see, but perhaps I'm wrong about that).
I see that you joined the Fast First Draft group. Perhaps that's the best way to begin. That way you can talk about your novel and ask questions about it without giving any personal details.
But as I said, I'm a newish member too, so I'm sure others will be along soon to give you more suggestions.
Well done on those 70 pages by the way.
And I hope you enjoy being here as much as I am.