If you stutter, just casually be like my bad i stutter. Dont overly apologize just acknowledge it so people know whats happening. 99% of the time people are like oh ok. Its when you dont and your face looks like your trying to shit out a watermelon trying to get a word out that people dont know what is happening and they feel awkward but theyre just responding to your unconfidence(is that a word). Its just human nature. Also it shows confidence and people respect you for owning your shit.