We are not born social anxious, our experience make us so,i will describe it as ,it's in a head but from other people ,like we get negative approval from people , it makes us feel bad and we don't want same again so it creates anxiety, And anxiety makes our stuttering worst . Like people don't know how to behave when someone stutter or people don't expect that someone can stutter Other day i was having difficulty in answering call, i was having blocks and couldn't able to finish my sentence ,other person think i am high or something ,so it's easy to think i am high than i could stutter and give me some time rather than cut call in rude way and make me feel bad about myself. And misconceptions people have about stuttering it is worst, like oh you don't eat chilli, that's why your voice is not clear.