First off, hi and welcome to the forum!!
It's something that you just learn to accept.. I will say that once you have one good spill ad realize that it isn't the end of the world you can brush it off and get back on easier than it was to have to be scared the whole time you're riding. I've had a few rough spills but I have had the worst horse related injury on the ground. I got kicked in the back by a mare when I was walking out of her stall after cleaning it.. Witch.
Getting over the fear will just come with time, especially when you are getting more comfortable and confident with your riding. Eating dirt a few times will happen, hate to say it, but more than likely you'll be fine and can get right back on. I dislocated and broke my elbow falling while running barrels and I was back riding a week later with a full arm cast on. It's just part of riding and being around horses in general. I don't know one person who hasn't had some kind of accident with horses.. My dad says it's not if you get hurt with horses, it's when and how bad. I don't mean to scare you, I'm just giving my two cents and saying it's likely to happen, but once you have that first fall things will be a lot easier.
I am Sparkly Meanie Doodie Head and I approve this message!