I’m pretty sure they usually rotate positions in fast food, but I’ve never worked in fast food so I’m not sure. Either way, you’ll likely get used to it and get better at it. I have worked in a grocery store and I got used to answering the phone and talking to customers. I even became a department manager, and I have a very severe stutter. You’ll be fine. Just remember, it’s fast food, they’re just happy you showed up.