Need Job Advice

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Hey /adv/. I need some help here.
I just picked up two part time jobs in order to get some steady income and crawl my way out of NEET-dom.
I enjoy one of them immensely. I mainly unload freight trucks, organize stock in the back warehouse room, and stock shelves / manage product. It's perfect because I don't have to deal with customers that often, which is a skill I do not possess. I can deal with people under any other circumstances, but for some reason it is extremely difficult for me to deal with customers in the service industry. Especially when it is a fast paced environment and I'm on a register with ten other people lined up to order. I tend to make mistakes and panic.
Unfortunately, that is exactly what I do at my other job. I've only been at this restaurant for a week but already I get the feeling my co-workers don't like me (I've heard them talk behind my back and crack jokes about me), I'm bad at working the register (not really a surprise), and I'm sensing an immediate termination of my employment coming soon.
At the stocking / freight job, everyone is extremely friendly and of course we make jokes about each other, but they're all in good nature. However, I don't get many hours at the stocking / freight job. They've talked about giving me more hours though because they've been saying I'm excellent at the job, especially considering it's my first job.
But I don't want to stick around this restaurant. It stresses me out just getting close to it. I get bad vibes from that place. Everyone there is not chill at all. I've already begun seeking a new job to fill its place, and I've already set up an interview and applied to multiple other places who need stockers and freight people (since now I know that I'm good at that).
Should I just quit this restaurant job right now? I'm obviously not cut out for fast paced work in the food service industry, and it seems like I'm just wasting everyone's time by working there.