you should find out who your teachers Rabbi is(where he davens)as this issue is more then you can handle, but needs to be addressed by someone your teacher respects.
Look up the number in the phone book or walk over to the shule after tefilla After you describe the situation to his Rav perhaps suggest a meeting between him his Rav yourself and your parents.
Also regarding your own questions if you feel comfortable enough you can speak to your own Rabbi or Rebbetzin of your Shule that is what they are their for.
So sorry you are going through such a stressful time.
P.S.If the above does not work there are a few people that you can talk to regarding your many questions and also will find a way to reach out to your teacher all the following are accessible and have listed numbers
Rabbi Yaakov Salomon at Aish, Rabbi Wallerstein with Ohr Naava (you can just head over to Ohr naava if you live in brooklyn),
Rabbi Yaakov/Jacob Jungreis
Rabbi Chaim Cohen (Rov of ger shteible and a dayan)
Rabbi Dovid Goldwasser
Aside from all being well equipped to guide you they can also help facilitate a resolution, as the situation you describe is intolerable and should not last another day
Hatzlacha!