I'm pretty sure that just about every single person could use a therapist. That is, an empathetic, non-judgemental Reasonable Authority Figure who you can talk to about anything without worrying about inconveniencing or overloading them, and who knows how to gently guide you towards healthy, productive thought patterns and away from unhealthy ones. People who truly don't need someone like that in their life are likely a small minority; much more common is, probably, to simply think that you don't.