Definitely motivating yourself, and reminding yourself why you are trying, and where you want to get is a powerful thing. I spent years apparently being taught how to ride based on how I LOOKED on a horse, not on being an EFFECTIVE rider, so when I started working horses for a different dressage trainer, I did have to (and am still) relearning how to be an effective rider, and look good while doing it. It explained a lot of things to me, and made me feel better in one way, but it also made me feel a bit like I was going to lose control of the horse, because I wasn't relying on the bit to stop the horse, I was using my seat and legs.
My old trainer also didn't really have a lot of respect for me as a student, and pushed me at times when I think taking a step back would have been better. Because of that, I am now a chicken when it comes to jumping, though I do love to do it, but my TB coming back from a few weeks off because of an infected leg wound, was immediately put over 3' fences, with no work up after being off, (I was riding her), and she started having problems, and refusing fences, because she was being pushed herself, and I had to rely on the trainer, as she was supposed to know what to do, and ultimately ended up with, what was a grand prix jumper when I got her, a horse that no longer loved jumping, so I am definitely leery, but I know myself, and with a good trainer, great horse which sounds like you have, I think we both can make leaps and bounds in our confidence over time, you just have to stick with it. Taking a step back when needed is not a bad thing by any means. Keep your chin up, and just remember how free you feel when your horse is flying over those fences.