Should I just apply for disability?

I (20 F) think I am too stupid to hold down a job. I got a deli job a couple days ago and my boss is always on my ass about my speed. I haven’t gotten the basics down and it’s been four days. Nobody’s trained me and they expect me to figure out what to do on my own. Whenever I ask for help people get irritated and don’t show me. We are busy right now. My boss has asked me repeatedly if I have a learning disability and if I’m an idiot. I think they want someone who is more fast and experienced than me but can’t hire anyone else. I’m starting to feel I should file for disability or something.

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