My advice is to ignore as best you can the teasing your classmates are doing. I know that peer pressure is one of the biggest issues concerning kids and that it's tough to ignore but if you react in a negative fashion you will be giving those who tease you exactly what they want. Take the higher road and you'll always earn more respect. They might not realize it yet but someday they'll see their behavior was wrong. Let this remain their mistake, not yours.
My other word of advice is to just not talk about it. If other's can't accept your interest in Buddhism then don't force it upon them. If their reaction is to ridicule you about it, just don't give them the opportunity by opening up the topic of Buddhism in front of them. Eventually they will lay off if you don't remind them what path your are following. A lot of people are very comfortable in whatever faith they currently practice and really aren't very tolerant of other religious practices. That kind of intolerance might be wrong but a person has to want to change before they can. It sounds like the classmates who are involved in harassing you aren't really looking to change right now so just let it be. Just don't discuss it with them anymore.
I hope you continue with your interest in Buddhism. I think you'll find it really fulfilling. Please come around and ask questions is you need any help. There's lots of knowledgeable people here.
Metta
Ann
