Fast food workerrs‼️ please give me advice

I recently started a new job on the 26th it’s my first job since I am only 16 so obviously it’s in fast food. I haven’t had any big mistakes happen or anything but, the issue with my job is it doesn’t have training basically all they do is tell you what to do, have you watch them do it and then they have you to do it yourself and leave. The only station outside of the back that I’ve learned is milkshakes and prep when I’m done with milkshakes since they are a lot quicker than most things. I have nothing else to do because I don’t know how to do anything else. So today when I was finished with the milkshake station I went to finish prep since my shift manger pulled me away and I couldn’t Finish. After I did that she proceeded to tell me that we (the staff) should stay up front until she sends us back. But then she tells me not to stand around and not do anything. when I literally don’t know how.

I’m so so stressed and get so much anxiety I almost had a breakdown when I got home because I work 5 days a week next week and am already having Throw up anxiety from it. I don’t want to quit because I hate quitting things can someone please give me advice! I don’t have a mom/dad or older sibling for advice so please help sorry if I’m being dramatic I just need someone rn to help me :) ty

Also my co-workers told me when it’s busy (my dinner whole shift) to never ask her because she gets mad.