Both Hate And Am Bad At My Job

I took a new job fairly recently and I was over the moon. I was going to be doing work I had a lot of experience in, and gaining even more depth/volume. Turns out that it was a complete bait-and-switch. There is a task that is one line of my job description, and they did not tell me during the interview process that it would take up 80% of my work hours. And it's a task that I have the least qualification to be doing, and if I had known, I wouldn't have even continued in the interview process. Because it's not what I wanted to do. So now I'm currently stuck doing work that I hate, feeling like I was conned, and I'm not even good at the work so I look terrible. I'm so ashamed and embarrassed and sad and enraged. I am applying like crazy but in the meantime I am sick every morning and night thinking about going to my next shift. I cannot afford to take much of a step down pay-wise so my options are limited, more so in the current job market. I'm one bad interaction away from walking out and becoming a cashier at Costco delivering for Domino's at night.