I totally agree that the more you put yourself out there in uncomfortable situations, the easier handling embarrassment becomes, sometimes to the point that it won’t bother you at all; and sometimes to the point that you will still feel it but will have grown emotionally and are able to sort of feel it, have a few minutes of embarrassment and then kinda just shrug it off. Also as a fellow stutter who is currently working in the service industry, sure, you’re going to find yourself in stressful situations caused by a customer rush or the Karens of the world doing their entitled Karen thing, and yes, it might make your stutter a little worse. But you’ll also be surprised by how rote and boring some of your speech-related job duties will be, and how you find yourself repeating them over and over and it might actually help you feel more relaxed and have an easier time speaking. I remember when I was a reservationist at a super busy restaurant I really struggled on the phone, but within a couple of months of basically repeating the same info over and over, my speech became pretty fluid even if it was a stressful night. Hang in there, you can do it!