I don't know if you are afraid of becoming a murderer, the way you describe there is a very good chance you won't and if you're afraid you're a psychopath you probably aren't one since I don't think a psychopath would care or be legitimately concerned about if they are a psychopath and could hurt people. I mean have you ever actually had thoughts of harming people or are just afraid you will because you're worried about mental health? But certainly nothing wrong with getting help if this is concerning to you.

Also mental illness doesn't=violent individual, so even if you do have a mental illness it doesn't mean you'd do anything violent or get locked up forever....So certianly go to therapy and try and get help you need and maybe some more understanding since you feel your family doesn't get it.