Originally Posted by epjjensen
personally, I would keep looking, I would find a smaller size like 16" or 15.5". I used a 11.5" english saddle when I was ten on my 15.3hh. Horse. I used a 14" western saddle on the same horse. I would contact the seller and ask for a 2-week trial. Hope you find a great saddle!
Your 11.5" saddle may have been mis-measured or this was a typo. My 8-year-old rides in a 16", though she should ideally have a 15.5" (room to grow). There's no way you fit in a 11.5" saddle as a 10-year old.
Horsecrazy, if you're currently riding comfortably in a 15 or 16" Western, then you need at least a 17" English, or maybe a 17.5", as Corporal suggested.