i have that same fear as well. sometimes it stops me from doing great things like walking up to a girl and asking her out for that simple fear of she turning me down or someone shouts after me and makes me ashame in public and the fear that i won't be able to give that person a good enough reply would make me stop. sometimes i jus say fuck it and i say how i feel no matter what and that makes me feel great, but when i'm in a large crowd it still comes back