Want to quit my job I just started, but scared to do so, help? (lowkey vent but am looking for real advice)

I just finished my 3rd shift at my new part-time retail job. I just work cashier for a relatively big pet specialty store.

Context about my thoughts on the job:

I dread each and every hour, and I regret saying I could work the amount of hours I do (frankly, I was not careful and when the manager asked me, "how many hours? [number]?", I just said yes.)

There's an aspect of lack of control with my position in this place; there's a lot I cannot do because it's not within my mandate. I'm not expected to learn about all the individual items, and I'm not qualified to learn and give information about pet specifics, so every time I have to call a pet expert in our store, I feel out of control, stressed, and antsy as the lineup of customers start growing while I wait for someone to come.

I know I'm new, but I've had a relatively decent amount of retail, food, and cash register customer service experience and I've never dreaded it as hard as I dread this, mainly because I felt in-control and confident in what I'm doing.

So, after my 3rd shift, haven't even received my first pay check yet, I am highly thinking of quitting. I've never quit a job so soon before. I am VERY anxious about bringing in my 2 weeks. I keep saying that I'm going to "stick it out for a month" but I'm lying to myself.

I am afraid of the judgement I'm going to get from my managers for resigning when I've barely even finished my training. What do you think I should do, should I keep trying it? Do I quit ASAP?

If I quit, how should I go about it? I am very, very anxious about it.

Tldr; feeling like I'm suffering at my VERY VERY new job, want to quit but am afraid of the judgement from my managers from leaving so early. Any down-to-earth advice? Thanks.

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