doesnt sound exactly like stuttering in my personal opinion. thats usually something you’re born with or develop really early, though there are cases of stuttering appearing later in life. as someone else mentioned, stuttering usually feels more like a physical block than a mental block. it’s possible this is just nerves, though you’re the only one who could know. if you’re really concerned, consult someone. (i hope this doesn’t come off as aggressive or invalidating ahhh)