What fraction of people start playing paintball and end up shooting someone?

I am an 11 year old boy and I want to buy a paintball gun.The only problem is that my mom says that you get practice and eventually get a real gun and shoot a person.I want to know if she is overprotective, or if she is right.Also, if anyone knows, how many people start playing paintball and end up shooting someone?

Any answer is helpful!Thank you.