Don't feel stupid, everyone makes mistakes, and by making them mistakes will help you understand what you did wrong, so then you can fix that problem.
Jumping isn't an easy sport to do, and YES it can be scary, you just may need to lower your jumps and take your horse over it at a smaller level and work your way up from there. It's not just about your horse, its about both of you working together, so if you are not confident don't do it, just work from a level that you are confident at and you will be more confident then to go higher.
And don't worry about the fall that you had, cause you will have probabley have plenty of falls off horses over time, iam very pleased that you got back on your Nobal Steve LOL
good luck with your horse in the future