Me too. I block more than stutter, which can sometimes be worse. Especially mid conversation, when I'm halfway through a sentence and block. It's just so awkward... I do much better with it when I can talk freely and I'm not put on the spot. I hate when people ask me something I 100% know, such as my age, name, job etc because I know I HAVE to say a certain answer. I can't use different words or choose to stay silent.