So when I was at that age, a little older actually, it really came to a head for me.  I thought about it all day, night, next morning, it was my scapegoat for everything and it got to the point where I knew I couldn't rely on an outwardly solution, it had to come from within.   You kind of came to terms admitting what us happening, you can't get it out.  You want to talk, it is prohibitive or prohibited so you need to do what ever else because what else is there, it's tightening, hindering what ever, not letting you continue.   When there is no choice, no magic, all that's left is to except it and figure out how to make it easier.  I knew when someone hangs up I am free to talk again. When I am alone at home I can say what ever a thousand times over, until it's on the menu or something at a restaurant.  I had this feeling the less I cared, like I am at home, the easier it would get. So I came to terms that I needed to have a fall back or 2, stick to it, forget the confusion and fear, and not dwell on it.  The reason I didn't wanna dwell on it is because I noticed the more I avoided words or situations, the more scared I'd be next time.  There seemed to be a head component that raised the severity because I couldn't understand why I'd otherwise stutter on something I said fluently until someone asked me to repeat it.   So I got angry.  I got emotional, and I swore to myself, "enough of this shit!"  I'd never avoid again, I didn't wanna make a big deal going out of my way to say or do things I wasn't interested in, the less confusion and over thinking the easier.  I just started, didn't think twice about anything, and sometimes it would take a long time, once it's over, didn't even think twice about it, it pissed me off too, I rolled my eyes at the thought ready to happily move on because I knew anxiety doesn't change anything so why, why bother!?  Seriously.  Break free from it!  Break free from your own head!   I fell on repetition.  I didn't wanna exhaust myself fighting this nothingness, I'd rather repeat and though sometimes it took a while, it didn't take any longer than me tensing through it or blocking out and when it finally came out, first it happened out of no where..just became any other word all of a sudden and second all my energy remained so I was smiling.  I did this for the longest time.  Maybe sometimes I'd fall into a breath out with sound to get started and keep that back end from closing up but repetition got easier and easier the more I let myself do it for a long time.  Just had to get through the fear and uncertainty of whether it would let go, it always did.  And I fucking smiled after :D Then it's like the body began getting used to whats possible and what felt impossible and took forever got less and less and it worked itself out over time and the word really did become like any other and I finally began feeling the way I do at home alone with all those circumstances I once feared.  Feel the fear, do it anyway, if the embarrassment or fear creeps up, get angry and then confident because life had to nerf you you're that cool!    Just do it, the more you think about it the more you get in your own head, you'd be long done by then, not give it a second thought, and life goes on :-)   There's no cure but the worst of it can be conquered.  You just have to come face to face with the worst of it, over and over, and enjoy every minute of getting over your fears and realizing you are still so awesome to everyone but most importantly yourself.  I'll give you a hint, everyone's too busy thinking about themselves, they'll move on with you without a second thought either.