Only stuttering in social situations

Only stuttering in social situations I’m sure I can speak for everyone when I say I stutter when another human is involved. If I’m talking to myself or to a baby or pet, I don’t stutter. I recently looked up pSTS, or Posterior Superior Temporal Sulcus, a part of the brain that deals with social situations. It’s just a theory, but does something happen with social situations and stuttering? Of course, there’s anxiety, but if you’re talking to your mother, you’ll still stutter, so it’s not always anxiety. Could a part of the brain be behind this?