I read through everything that everybody said and I just felt like a good chunk of it was commenting on the rider I was eight months ago. I have since moved on from my fear of mounting, and I never had a fear of cantering. When I first started riding my lease gelding he size was a bit intimidating, but I got over it with the help of my friend and my trainer.
No, I am not a brave rider, but I am certainly not shaking in my boots and needing somebody to hold my hand every time I go out to the barn. I still go out 4 to 5 times a week and ride w/t/c, quite often by myself.