If you don't want to go to an adult because your parents are... you know... don't understand you and wont try then If anyone says something rude to anyone give a horrible glare that tells them "Your the lowest form of life. Do everyone a favor by leaving... now." Your image is a weapon on its own. Just be careful you don't get attacked later.
Well it sounds like this teacher may have it in for you and not others in the class. What you need to do at this point is tell your parents what is going on and have them speak to the teacher as well as the principal. If it continues then have your parents take the matter to a higher authority.