I had the same problem when I was in high school, and in college when I didn't eat at the cafeteria, but at the restaurants on campus. I didn't complain to anyone, I used people's annoyance to better me. The main reason that my stutter continues to haunt me is because it takes me out of control of the situation, but when I see people getting rude and upset because I'm taking so long, it gives me the ability to think that I'm the one holding up the line, not because of my stutter, but because I want to. I know it sounds mean, and I don't know how it happens mentally, but trying to reassert your dominance in a situation can make all the difference with a stutter