When you don't make a sound, your tongue is too deep and your chin muscles will be tense. Is this right?
I'm nervous without making a sound ~ ~ ~ This is obviously too nervous ~ ~ Try yawning very relaxed and gentle, or take a deep breath very relaxed and gentle. When doing these two movements, you can touch the meat under your chin with your hands. If it is soft, practice it when you have time. Don't ask me what my specific actions are every day. You just need to rely on your instinct to relax and do it naturally.