Hmmmmm. Maybe try dropping your jump height?
There is nothing wrong with being a very cautious person, but maybe dropping down fence height can make your brain say, over time, “I so have this height, I need more of a challenge”. You might be able to actually jump your current height just fine but this approach can really help build confidence and a real foundation in the idea “I can do more. I’m going to do more. I so have this height that I’m a bit bored at it”. OR, maybe you’ll be happier dropping down to a height you know you can easily get over for a while and can work on something like your position, better roll-backs, better adjustment of stride, or just something else for a while.
I get the perfectionist attitude. But I’ve come to be comfy with the fact that I’m not a pro trainer, I’m not an Olympian, and I will make mistakes. I have had to come to ACCEPT that. I’ve had such great relationships with my horses that I say to them “I give you a good life, you tolerate all my mistakes. It’s all good!”
Riding should be fun. Consider dialing back the work or doing things that will reinforce your partnership but you know you won’t be good at. My current horse was SUPER hypervigilant and spooky when younger. I ride dressage. I ended up going to QH horse shows with my QH friend because those environments were just crazy. I became confident by riding him in an arena with a pony and cart and eventually making him tolerate that. We mostly pinned in classes when others made mistakes and there were many times that he would not go to an end of an arena because of a flapping flag, people cooking out next to the arena, etc. (I learned “who cares” but I did earn a belt buckle!!) I taught him to tolerate and then accept working cows. I taught him to tolerate trail rides. We learned natural horsemanship stuff with a qualified NH trainer.
The point is that I participated in lots of events where I KNEW we weren’t going to be good (My Westfalen worked cows with QHs. We SUCKED in comparison!) But our relationship really built and my confidence really built. Now, I have so much more of an attitude that “if I can get him through the ditch of death, I can get him into that corner” and “I know you can go through the ditch of death, and I know you can get into that corner. Don’t even tell me you can’t”.