My advise would be that you follow the law. I know in Ohio you must be 21 to own a handgun. You may think your ready to walk around with a loaded weapon and you may well be, but in the eyes of the law your not ready. You could end up getting yourself and whoever purchases the handgun for you in big trouble. You would put yourself at risk of not being able to legally carry a firearm ever again.
I certainly don't want to discourage you from shooting and learning about firearms but you to do it within the scope of the law.