Agree with the others! You are a crum on his back!
I'm 5'6, 64kg and my legs go below my horses belly line with a saddle on, at my dressage length. And he's 15.3hh!
I have friends who are over 6ft riding in heavy western saddles on 14.3hh and 15hh appaloosas doing reining. No problems!
Believe me, if you still had any doubt in your mind, our appaloosas are tough characters!