My stutter totally vanishes when I am alone. It is like barely noticeable when I am with my boyfriend, like I hardly ever stutter when I am around him. But it is more noticeable when I am around others. I brought this up to a speech therapist years ago, how I hardly ever stutter when I am with close ppl in whom I trust, but it is significantly more present in front of others. She told me then that I could have Tachylalia instead of a stammer. She told me that stuttering has a genetic base, while tachylalia has an psychogenic origin; which could explain the strong variation of the intensity of the stammer, depending on the context. I remember that she explained even that it comes from being overwhelmed (like overwhelmed with emotions, negative and positive, or even overwhelmed because my thoughts are going faster than what my speech capacities can process, and then she gave me the example of Barack Obama- he doesn't have an speech impediment, but when his mind goes too fast, he tends to not speak fluently, which is an example of tachylalia). I mean, out of the many therapists that I have met through a lifetime, she was the first and only one to diagnose anything different from a stammer for me. I don' know how many therapists would agree with her, but I did find that enlightening.