I start to hate my life after every shift at work and I want to resign.

I start to hate my life after every shift at work and I want to resign. I work as a cashier at a bakery. There are times when I speak fluently and there are days when I want to resign from the shame of not being able to open my mouth. It just embarrasses me to try to tell a customer the price they have to pay and the words don't come out. It's hard for me to see the other employees that customers remember and they have a conversation with everyone and it's just me with a stressed face 24/7. Every day I come home from work exhausted and wonder how money will help me if I don't have friends, if I can't talk as much as I want and when I want. People who stutter never win.