If you are under 18 years old, your parent or legal guardian must sue for you. The exception is that, in some states, emancipated minors can sue on their own. When your parents or guardians sue on your behalf, they must fill out a form asking to have one of them appointed your guardian ad litem and have the form signed by the judge. "Guardian ad litem" means "guardian for the purposes of the lawsuit." Ask the court clerk for the rules in your state.