Anxiety about first job interview

Anxiety about first job interview I've worked for family friends throughout high school so I've never had to go through the interview process and honestly, I'm terrified. I'm now a legal adult living on my own away from family. I have an interview tomorrow afternoon for Dominos (not fancy but it'll pay rent) and I'm stressing out pretty hard due to my speech. Does anyone have any advice or anything to calm my nerves a bit?