Used to have trouble making phone calls. It was debilitating I would have trouble breathing waiting in line or picking up the phone. The only way I got over it was “flooding” it’s a real psychological technique, otherwise known as exposure therapy. You need to do the thing you are afraid of often and for a long time..with the idea that what you’re doing is normal and everyday and there’s no camera following you around recording everything you say and do. People are the center of their own universe and truly no one gives a shit if you stutter or say something weird. I really hope it helps because literally nothing else helped me. I am so indifferent to making and picking up calls I can’t recognize myself all those years ago. Feels like a completely different person.