Stuttering while being a cashier

Stuttering while being a cashier So I work in a grocery store where sometimes I have to talk to the customer. But the thing is when I do I start stuttering and I start shaking because I feel like I’m gonna mess up everything so I keep stuttering on and feel like shit afterwards. As a text message down I have started to talks calmly and slowly but I must make it a habit because it lowers my stuttering by a lot but I hope that someday I won’t feel like shit when talk to People. Ps sorry about my grammar