I think it is probably called "selective" because you kind of get to decide when it operates. It would be detrimental to have it kick in at work so you don't use it then whereas for whatever reason, with your friends you may be trying to help yourself by not talking, not yelling at them or telling them to go away, etc.

It doesn't sound like you ever got therapy for it? So, don't know that it would go away when you got older. They're looking into biological causes now too:

http://www.selectivemutism.org/find-...3-teens-adults

Like your new name too, Griffe.