Once you get in highschool it should probably be easier. People in highschool are usually more out-going and finally understand that people have their own interests. And going out and telling them you're a brony probably isn't a good idea, just wear a piece of MLP apparel every time and again and if/once they ask about it, tell them you watch MLP. If they don't know about the fandom then the first thing that'll pop into their heads will be G3.5 and under, do anything you can to sway them from seeing the show as this. When I told my friends i watched it, I let them know that the new series is by the same creator of power puff girls, which they just so happen to like. Of course they were my friends, so even if they didn't understand it, they wouldn't have treated me any different. Maybe I'm just lucky to have matured friends. Good luck with your endeavor!.