I hate having a stutter

I hate having a stutter So Today, I was in a Queue in a Takeaway restaurant and I was nervous thinking the workers are gonna get pissed off, and then when it was my turn, I asked what I wanted, I had to hold in my breathe to avoid stuttering, and then I mumble for holding in my breathe, and the worker got pissed off, that gives me stress, my stutter gets way worse while I'm stressed out, I tried so hard to get the words out and the worker kicked me out of the shop, I was really embarrassed and felt insecure. It's Fucking tiring for me having to talk with a severe stutter.