@angrboda I'm hyper competent at my actual job & work extremely hard and I still go through periodic bouts of thinking 'you're the weak link and everyone thinks you're lazy' for extended periods. Those stretches used to terrify me and convince me I was gonna get fired before I realized they're just bouts of bad mental health and they'll pass.
It is super easy to be doing bad mentally and not have folks around you in the workplace notice. In my experience the version you're getting of everyone's life at work is a second or third edit, which is something it's really helped me to keep in mind.