I have never been able to mount any horse above 14 hands. I'm not super flexible, and I think my legs are short because I can't seem to put my foot in the stirrup at all. I've gotten on by fences, inclines, rocks, and mounting blocks my entire life. I'm honestly embarrassed by it and I wish I was strong enough to climb on without help. Get so jealous watching people effortlessly step on their horse.
I've seen people shorter than me get on a tall horse and I can't figure out why I can't do it lol