I've been in this exact same situation and it's not easy my friend. It doesn't get easier the more it happens either. They won't even remember this incident by the next day. I usually say 'sorry, I have a stutter, please give me a minute', laugh and they usually let me take as long as I need to finish. 98% of people will always react positively to that. It's worked for me and cuts the tension. I have also written what I want to say on my Notes app and show them, and say 'I have a stutter so I've written it down instead of me saying it' or just simply show them the text. Worst case scenario they might think you're neurodivergent but that never hurt anyone. A physically disabled person may have a wheelchair or crutches. They are blessed with a visual cue that screams 'I struggle to get around!!' Those with invisible disabilities may wear badges. So we as stutterers need to adjust our interactions to make life easy for ourselves. That includes making it obvious to the other person we stutter, or using text. Anxiety makes stuttering worse so these techniques should hopefully help with that. You're doing great. Don't be ashamed, brains are too complex NOT to have hiccups in their neurological functions.