My sister is always putting me down?

My sister always puts me down about what I wear or the things I say or about me being Buddhist. She's I'm a weirdo or a freak or a cow for being different. She says she gets embarrassed being with me because everyone in my town thinks I'm weird, which I know is true because they all look at me funny. And that may be, but shouldn't my own sister be on my side? I'll be the first to admit that I'm a tad different from most teens but I like it that way. I like being open-minded, doing my own thing, saying what I think and being kind of free from crouds. I find that they're all backstabing bitches and really boring cause they're all the same, fake!!! At times I think that I am a little to weird and get worried that people do think the worst of me, even though I'm fine with myself. My mum says I am different and I'm the type of person to do my own thing and that there's nothing wrong with that. My brother also calls me a hippie freak. When my sister does say cruel things, I pretend to laugh it off but really it hurts inside and I consider changing myself because I'm 'a freak'. Should I change? How do I tell my sister to back off and worry about herself? I like being myself. It's easier than putting on a fake person. Please help! :)