Quite normal to have anxiety about entering a new job, and depending upon the opportunity you have the challenges can be great these days. At least in the U.S. most schools class room sizes are daunting making maintaining discipline a daunting priority that can reduce your ability to focus on education, teachers tend to be undervalued both financially and socially, and these days extreme ideologues on both ends of the spectrum are trying to politicize what you teach.
That said, it can be quite rewarding. My mother was a teacher for parts of 5 decades and I saw the way she beamed and rejoiced every time one of her students went on to great things, and particularly when they took the time to come back and personally thanking her for opening their eyes and minds to something or other.
If you want to consider first teaching job anxiety, consider the barriers my mother overcame. When she graduated from teacher's college, the Great Depression had just hit. The only teaching job available was some 500 miles away in a one room school in a mountainous mining and ranching communities, and the successful candidate for the job needed to bring in at least two kids so the school would still qualify for state funding. She had to talk her parents into allowing her to take two of her younger siblings with her, against her mother's wishes, take on a parenting role as well as teacher for the first time, leave her more urban environment and set up housekeeping in the provided teacherage in a rustic, rural community, all in addition to the challenges of teaching kindergarten through 8th grade in a single room. She not only succeeded, she and her siblings both flourished. Her younger brother later said she was the best teacher he ever had and the first to realize that he had never really learned to read, was raking it, and taught him how to.
You've got this. Follow your dream. We need good teachers more than ever.
