If you were trying to eat it raw like a normal apple, well, then that's your problem right there. Rome apples are cooking apples.
Take all your remaining apples and bake or sauté 'em. It's not too hard to do and there are plenty of recipes up on the web for these types of things. Then you can either eat it as is, or use it as a topping for ice cream, waffles, etc. etc.