You gotta take the fall as a life experience that will make you stronger, if you worry about falling all the time your not going to enjoy riding ever again. You gotta accept that if your going to ride at some point your going to hit the dirt its just a fact. I work with young horses I can't tell you how many times I've hit the ground over the years you just gotta get back on. I've gotten back on horses after some pretty painful falls but I can't stand the horse winning the battle
. Your taking the first steps already your getting back on the horse take it slow for awhile as your get more confidence increase the riding difficulty. If you have a way to take riding lessons from someone that could be a great confidence builder. Good luck to you, keep at it and don't give up.