Same here, but it was because of the other rider though. :/
I went to horse back riding camp and got the best horse, well, actually a pony but she had some quarter horse in here so she was a bigger pony. I'm telling you, I bonded with her.
But she was I wild one, so she liked to walk, trot, and canter fast.
Which made me scared at times, and she could feel when I got nervous. So I tried to stay calm but at times I just couldn't.
But I miss her so much.