Yeah, stuttering is known to vary a lot, depending on what we're doing. To emphasize the point: • You have no stutter when you're singing, because you're not *speaking*. • You have much less stutter when you're on your own, because you're not speaking *to anyone*. • Outsides of singing or being on your own, you stutter a lot, because you're *speaking to someone*. You'll probably find variance in interactions with e.g. babies and animals too. Try this as well: Record yourself and listen to it afterwards. Just you. Then, record yourself again and have someone *else* listen to it.