I feel comfortable riding 9 of the horses at the barn I ride at, even though I only ride 2 of them regularly (the others sometimes I will just ride them every once in a while). Even then, I can comfortably just climb on one of these 9 horses after months of not riding them and adjust just fine to them.
But today, after a group jumping lesson on Damper (one of my regulars), my one friend told me to try out her new horse, Enchello. The thing is, she doesn't board him at my barn, he stays at her house and for lessons she will trailer him down to my barn for lessons.
Anyway, I climb on him, and the first thing I feel is this feeling of insecurity as if I was going to fall off or something. His back felt so much different to the horses I usually ride, much rounder, not much to really "hold on" to. I start by trotting around on him, first thing I notice is how much my hands are moving around as I post and my legs were moving around alot. I then canter him. Same thing.
Then my instructor tells me to go over a jump at a canter and I was shocked at how terrible my jumping position was. I felt so unbalanced over the jump to a point that I had to rest my hands on his neck. My heels (which I can keep down fine when I jump on the other horses) were up over the jump and my lower legs flying back and having no stability...
I don't know why I had this sort of "rider meltdown" when I rode a different horse. Maybe it's because the horses I usually ride have something in common with each other? Or maybe it's something in my head? Maybe I'm just so used to riding the sort of horses I ride at my barn that when I ride something else I would have to get used to that type of horse (or something like that)?
I'm at a loss here...has anyone had the same thing happen? Or know some kind of explanation for this?