Poor baby :c (I apologize if my attitude weirds you out, I'm a jokey guy ;p) I'll be serious here, you can't stop people from being mean to you, that's a given. What you can do is go about your day and ignore than (it's hard.) you seem like a great guy, really... I don't condone bullying, but if they say something about you, maybe have a comeback ready? :P
Actually, what I said might get you into trouble...