I'm having the same problem, a friend of mine who is studying logopedie also told me i might have handled the "rest" by mumbling a lot more, which tbf checks out (went to 3 therapists, none ever told me about it b4), but yeah same, just can't get over the blocking, it's so awkward too because it make your whole body look like you have some kind of stroke (for me at least), my friends are used to it but the way people look at me in public sometimes makes me feel like a creep : /. Just know that you're not the only one, and try to hang out with people that accept it.