(1) I agree with those experts who say that "etc." should be
used for things, NOT people.
(2) There is a term for people: et al. It is very formal, but it
might impress your teacher. Your teacher might think: Oh, my! What
an intelligent student!
... in front of the teacher, my classmates, parents, et al.
(3) Some native speakers do, indeed, use "etc." for people,
but I would advise against it.
(3) If "et al." is too formal, you could simply write:
...in front of the teacher, my classmates, parents, and others.
***** Thank you *****
P. S. I would not say "foreign teacher." Here in the United States,
sometimes calling someone a "foreigner" is not considered polite.
If you wish to clarify the fact that your teacher is from another country,
you could write something like:
... in front of my American teacher, my classmates, parents, and others.
Student or Learner