Hi Guest,
That's a hard thing to go through because you feel guilty and it's also understandable that you are finding it hard to speak up and let your manager know that you no longer feel this is the right job for you because of your anxiety and it sounds like it may feel to you like you may continue not to be able to get out of this situation for longer yet. Being stressed for a long time is also no fun.
I've experienced things that were a bit similar. My first job was removing staples from documents at an office as well as scanning and shredding a lot of paper for a long time. (Shredding paper can actually be quite relaxing, but when you're shredding tons of paper over a very long period, it isn't so fun) and removing lots of staples from paper for a long time is also of course not fun.
My job recruiter told me before I started this job that she wanted me to be really honest and tell her if I didn't like it or even if I hated it. I was going to tell her that I didn't like it, but when I visited the place that helps me get jobs (I have a disability), people working there were really happy for me and happily saying things like "Are you enjoying your job? :D" so I felt like I had to go along with it and say yes because in this situation, it would be awkward to say no. This got back to my job recruiter, so she thought that I really liked this job. Luckily before I was offered the invitation to still work there, I managed to let my job recruiter know that I wasn't really enjoying it. I liked the people working there a lot, but the job really wasn't for me, so I didn't continue working there when the trail period had finished. A few years after I did this job, I actually thought that maybe I should have taken the job offer because in my memory at the time, it wasn't that bad and I was also having a lot of trouble getting a new job, but I am glad that I didn't end up doing that.
I think the best way to let your manager know, which hopefully you will eventually feel comfortable enough to do is to say to them that you like them and the other people working there and that you are very thankful for the opportunity, but you feel as if it isn't the right job for you anymore.
I hope you feel better and are able to get out of this situation soon because it sounds very stressful. Remember that you have the right to work where you want to work and if this isn't the place for you, that is okay. Even if your manager had a problem with you politely letting them know that you don't want to work here anymore (hopefully they aren't like that because that would be quite unprofessional), then that is on them.
I feel like I use to be quite a people pleaser, but I'm slowly getting better with it. I have anxiety too, so I know that also makes things very tricky.
