As someone has mentioned, can’t you make the subject interesting to you in the first place? I know I’d love to be paid to learn about the science behind food.
I’m a college lecturer and pedagogy mentor. I work with colleagues to introduce new teaching/learning techniques. Doing so I teach classes in pretty much any subjects (sports, health and beauty, drama, music, tourism, business….). Granted these are mostly one offs, but I have been in your situation too. There is plenty you can do with limited subject knowledge and still have plenty of learning happening.
If class management is a problem then get help with that. What you will learn from teaching in a difficult environment will stay with you and you will be able to apply that whatever the subject. It sounds like the situation has already escalated with your students as they have probably sensed your malaise in the classroom. That is not a nice place to be, but every teacher has been there.
Hope for you and your students that you get it sorted 🙂