Yep. I thought I was the only one because I hadn't heard of it years ago when I had a friend with a stethoscope who wouldn't believe me that I could do it voluntarily. Haha it's been well over a decade that I've remembered or attempted it.

Yep, still works.

Chewing gum used to help me not be so aware of it. And if it's any comfort to you, it goes away with time. For example; it was more frequent during my 20s