I started a new job and it’s made me so anxious idk what to do

I started a new job and it’s made me so anxious idk what to do I’ve wanted to be a bank teller for like a year now. I finally got the position and I was so optimistic for it, but I can’t fucking do it I have a stutter and I can help people in person and on the phone, but the second I do drive ups I trip over my words and fuck it all up, and I’m afraid if I address this to my manager they’ll look down on me or even fire me for being incapable. But I’ve been so anxious I constantly feel anxiety in my chest as I’m working which makes my speech even worse, and I just keep fucking up due to anxiety which fuels my anxiety even more. Even my time off and my days off are spent with headaches and anxious feelings because of this I don’t wanna quit because this is what I wanted. If I quit my parents will be extremely disappointed and I’ll be disappointed in myself. I’m so lost rn I’m on my lunch break on the verge of crying