After being unemployed for a couple of years due to chronic illness and then going to university as a mature student, I got a temporary job as an English language teacher (to cover someone who was unwell). At the interview, the lady was looking over my CV and suddenly said something like "Oh! Whoever looked at your application didn't look at it properly. We wanted someone with more experience than this, but it's too late now." For context, I had a teaching certificate from about 4 years prior and one year's part time experience.
Anyway, she gave me the job which was four hours a day for one week, with the possibility of more cover work in the future. The first few days went well, but then something went wrong. I was using lesson plans and materials made by the teacher I was covering for and I hadn't noticed that an exercise was missing from their worksheets. Some of the students noticed and started to look worried and confused. I realized what had happened and told them not to worry, to move on to the next exercise. There still seemed to be confusion so I went around the room and checked each student understood and got them to move on. I didn't think anything more of it, but the next day my boss came up to me and said a large group of students had complained about my teaching after that class, saying that they didn't understand what was going on, I had confused them and provided them with a worksheet that had a missing item. She asked me if I had given them the worksheets and not told them what to do. I said no, I explained everything, I just didn't notice that mistake at first. She didn't seem convinced and said "Well, it's partly not your fault." After that she randomly turned up in the middle of my lesson to observe me, which I guess was fine. After I had completed the week, she said she didn't think I was suitable to continue, and maybe I could contact them again when I had more experience.
I don't have much of an issue with her not wanting to keep me on (although it's a bit annoying that everyone wants you to be experienced, but then won't provide you with said experience), but I felt extremely anxious and guilty that a gang of the students had complained about me. Most of the lesson they were texting on their phones or just sitting staring into space not doing their work. They are paying a lot of money for that course, so I could understand with me being an inexperienced teacher they didn't feel like they were getting their money's worth, but they didn't seem interested or motivated during the lesson anyway.
This has completely knocked my confidence. I'm sure it seems pathetic and like I'm being too sensitive. When I told my friend about she said "meh, forget about it." It was a huge deal for me to work there, if only for a week. I am still dealing with a chronic illness and have really low self confidence. I had such a positive experience with a different group of students at the start of the week and it just keeps going around in my head that I was a terrible teacher. I don't know how to stop feeling awful over this experience and scared to work again.