Nothing you do matters, but NOT doing it also doesn't matter. Whatever you do or don't do in the end it doesn't matter, nothing does.
What is that thing in the back of your mind that you truly WANT to do but are scared of failing? It's not going away, it will re-emerge, gnawing at you every burnout until the end of your life.
It doesn't matter if you succeed or fail at it, because either way nothing matters, so might as well try it.
I AM the human cashier when I do self-checkout. People don't care WHO or what does it, they themselves just don't want to.