Theoretically, it is possible. However, there is a prerequisite: 1. Excellent grades, not only did not fail, but at least got a scholarship; 2. Be sure to consult a psychological counselor, and sometimes you need to pay some fees. But there are many problems in changing majors: for example, from freshman year, that is to say, studying for five years, solving the dormitory problem. Therefore, unless it is really not suitable for the current major, most teachers will not recommend changing majors.

In fact, after graduating from physics (normal school), you can't just be a teacher. As long as you are good enough, you can have many ways out. Besides, there are not many professional counterparts now, so don't be too pessimistic. Maybe you will be interested after reading it!

I hope my answer can help you!