I was in a similar situation a couple of years ago. I bought a horse that turned out to just be too much for me-he had a "happy buck" over fences. Very athletic, nice mover, great bone-I paid $4500. Worked with trainers (more $$ put in), then finally decided he just was not going to be the horse for me with my confidence issues. So, I took him to a H/J barn and proceeded to actively market him. After several months (again, more $$ thrown to the wind) I basically gave him away (for $500) to a friend of my trainers who had the ability to do something with him. 6 months later, horse is selling for $15K and goes to a great home. Everyone is happy (except my husband....lol) but the bottom line is-I NEVER could have done that with this horse. He is now competing in eventing and has a great job and a great future.
I suggest you find a great home for yours that will give him that chance. I now have a horse that is fun and has done wonders for my confidence-you deserve that too.