I don't have a problem with people who believe differently, as long as they don't push it on me. That includes making laws; laws should be as open as possible to allow all beliefs.

As many have said to disorders, it helps to educate those who will listen. Being open about your beliefs may draw out others who are hiding or shy about their beliefs, even if not Wiccan. If you wear a pentacle, and they tease you about it, you might point out to them that Christians (since you say most of them are) used this same symbol to represent Jesus once. This was done when they were trying to convert the Pagans.

Maybe you could talk to your school about a class or a seminar (what are those events that take place in the auditoriums called again?) on all religions and non-religions. Of course, that will depend on your school's policy of involving religion. I'm for separation of church and state, but I believe there can be classes on religion without proselytizing.