Doesn't your teacher have an office? Go home? Can you find an excuse to say that you will look for him in the office next time? If it really doesn't make sense, then you must go home and go during the day.

I'll give you a trick: find a good classmate, or a girl, and go with you. And let her

Wait for you outside the building. Call her in case of danger.

Or something violent: carry pepper spray with you or make one yourself.

The method on the second floor is also ok.

Be calm when something happens, and life safety is always the first, remember.

Good luck.

Teachers nowadays are really not reassuring. ...