I remember trying avoiding riding somebody elses horse, even if it had better qualitys. I seamed to like sticking to the horses I trust and knew their buttons. Now riding and training at a horse farm has really helped me. Now, I get on the horse with the mind set of "how can I ride this horse to the best of his own abilitys."
This is where I'm at! It's so frustrating to feel this way too. I haven't found a way to overcome it, I thought I was the only one who has EVER felt this way. I would love it if you write an article and give advice on how to overcome it!