i follow the religion sikhism and i wear a turban?

i have been wearing a turban for all my life but now since i am entering high school and am of an older age i need to start wearing a different kind of turban such as this http://www.ratemyturban.com/files/photo/photo-560365.jpg (this is not me in the picture) what should i expect people to say to me? and i have known more than half of these people for about 2 years. i also go to a private school so there are like no people making fun of each other or anything like that

Depends on where you are. If people haven't already said something to you about it, chances are that they'll leave you alone about it. I expect people will probably treat you like they've already been treating you. Some may have questions about it, you might get one ignorant person saying something bigoted, but really, if people have been understanding (or at least quietly tolerant) about it, then you can more or less expect the same. What they say in private, I don't know, but people seem to be polite where you are.

You're going to get a lot of ignorant idiots thinking you're an Arab Muslim.

Don't expect people to say anything. If people do say something, take a minute to consider whether they are just being rude.
If half the class has known you for 2 years, they should already be adjusted to the notion of Sikhs in turbans. If not, your parents should go to the guidance office on the first day.