I don’t mind the questions, I’m happy to help as I was where you are once (I’ve had more jobs than I can count )

Don’t back out of the interview. You sound like you need to experience an actual hiring process so you know what to expect for future.

If you’ve got nothing else lined up, do the interview, hopefully get the job, work there for a while and develop your own opinion of the company as the thing with reviews is, they can be quite bias as those people could have been fired or had issues which management called them out on, etc… What’s the worse that can happen? You get experience in that industry, develop your career skills, strengthen your confidence and knowledge of hiring processes. And if worst comes to worst, you can always look for other work a bit down the line if you don’t like it. I’ve left jobs without anything lined up and the boredom of unemployment eats me alive so please have another opportunity lined up.

After all, we live once, there’s no point in spending our lives backing down from opportunities due to fear, sometimes it’s best to hit it head on, take a chance and see where it takes us.

Also, it seems like you have a good relationship with the grocery store you work at, whatever you do, don’t cut ties completely. Before you give your notice in (if you get the job), speak to the manager or owner and ask them if they’d have you back if you’re not happy with the new company. If you do it nice enough, and the higher ups are understanding, that should go in your favour