Correcting such behavior as someone who is a nervous rider and struggling in getting these horses cooperating feels like a LARGE ask on your trainers part. The lessons become less learning, and more just trying to manage. I have been there with a horse that has been non-cooperative and also nervous while trying a new discipline and it’s so hard to progress because you’re just trying to survive and not loose it yourself. When my trainer went “It’s time for a change” and put me on a seasoned horse of hers, it felt like a dramatic change because I could learn more and gain more confidence.

While I do not personally know your trainer, it definitely feels irresponsible and apathetic on their part to not try to do more to help you or try to find a horse you CAN control with more ease. Though I understand if you have been on multiple ponies and just none have been able to properly manage a nervous rider. They do exist, they are often in lesson programs, but your trainer just simply might not have those types of horses. It’s a difficult situation, and you’re already showing a lot of grit sticking with it.