I used to avoid self checkout for that same reason. Then I realized that these fabulous devices save me from countless inane pseudo conversations forced on me by marketing/management drones who train their employees try to force me to talk to them.
All you cashier people out there, no offense intended but I am not interested in talking to you. I want to pay for my stuff and move on. I don’t want your opinion on my grocery purchases. I want you to be the equivalent of a vending machine.
… Sorry if that seems harsh.