What exactly do you fear with her, CSR? What is it that makes you nervous? My suggestion to you, and something that helped me exponentially with my poor confidence, was make a list of everything that makes you nervous while riding, then find out how to handle those problems.
I spent several days searching this and other forums, and some other resources besides and made a long list of how to deal with bucking, rearing, bolting, a horse getting strong/fast on you, the horse trying to run back to the barn etc. The thing is, my horse doesn't do any of that stuff and really never has-it was just pointless fears I had because I didn't know what to do if that ever did happen. I still have my share of confidence issues (mostly on the trails), but for regular everyday riding around the property, I can get on her bareback with no fear now, because I'm prepared and can handle anything she decides to throw at me.
Knowledge is what really, really helped me with my confidence.