Hi OP. drive thrus - especially when they are busy or seem annoyed already - yiiiiikes. I (40F) was so excited about online ordering apps when they appeared because I used to dread calling a busy restaurant, say delivery (D is my nemesis) then place an order AND give a credit card number in an era when (thr, and f) were obstacles and my # had a lotta 3s and 4s. Felt like a class a moron more times than I can count. It gets better; you feel more comfy in your own skin and voice as you age. Try reading aloud to this metronome set at 70 bps for a few minutes each day. A speech therapist worked with me as an adult on reading to a metronome to help establish a cadence and establish a beat in my head. I brush up on it from time to time when my speech is v bad. A syllable per beat. It seems slow but relaxing, and may give you an “internal timer” to think back to in those flustering moments. One foot in front of the other some days. You got it. https://g.co/kgs/gK9b3GW