When I was a kid i had this fear of talking. Sometimes i would stutter and would feel very embarrassed because of my stutter. I started stuttering because i was always afraid to talk to my dad. Every time i would say something to him he would get instantly mad and angry at me, so before talking i would always ask him " can i say something, but please don't yell"...this was my defense mechanism.
So, step by step, i started having this fear of speaking, i would speak very fast or i would stutter my words. I can say that i have overcome this problem, by doing trauma release and sharing my story is another step in my healing.