What kind of lawyer is this?

When I graduate, I want to become a lawyer. Or an attorney. Something legal like that. I know there's a million types, like defense attorneys, prosecutors, etc. I'm looking for a specific kind. I want to be one that helps teens. Like, a person who works in abuse cases or with troubled teens in some way. Not troubled as in sending them to juvie, but troubled as in helping them get emancipated, helping them get out of their crazy parents' houses. What kind of legal person is that?