I got a write up for making mistakes in the system the past two days. It's odd because I normally don't ever make that many mistakes and am terrified of getting fired if I make another mistake. My GM will tell me to ask questions when I don't feel confident but at the same time says things like I've been working there for 7 months and should know by now when it was only two days it happened..it makes me not want to ask questions.  I don't know how to be confident in myself and feel really embarrassed like I shouldn't even be working there. Any advice would be great. It's hard to move on when I could possibly lose my job.