in fact everyone will be afraid to speak english in public.but don`t worry about it because it`s okay for you to take that behavior.that`s all because that you have no enough confidence in your heart .you should first make your english better .and then you should have d confidence in your own heart that you can speak english well in public.Don`t feel uncomfortable when you speak english .just regard it as a conversation with your teacher.and of course you shuold know that if you speak it with others and then /your english will be better and better.wish u can say it out in public ealier.