Only just started a (temporary) job doing customer service. On the first few days it was fine but I had a pretty off day on Monday last time I was in where I was constantly making mistakes (not understanding certain requests, writing the information down on the wrong piece of paper, not knowing what to say when approached about an issue and I was even inadvertently rude to a colleague by not believing them 100% about the date)

Making dumb mistakes in an environment like that seriously fucks with my mental health as I feel I've pissed people off

This common with others here in work? I'm honestly pretty terrified of going in again after the last day I had.