Prep school for Jo?

It's seldom off my mind however bizarre it may seem to some but to be absolutely honest I just feel like doing a year or so in a Prep School but for over 18's who feel or developmentally are very much 8 to 14 year olds.
Something like actual lessons with day trips out and assignments to hand in completed and shared meal and recess times.
I really feel I need that structure and to be treated more like the child I am on the inside.