When I was a brony in secondary school my mates did make fun of me (even the one that made me a brony) but I got by and nobody really bothers me about it now, although that's because they all think I stopped being a brony (which is true, but they don't know I've gone back to watching the show).
As it is now, I'm not letting anyone know. My brother found out which was kind of unavoidable but that's not really an issue.
When it comes to advice, just try not to care what others think and do. I got very emotional over the tiniest of slights in primary and secondary school, and it did not result in a nice time, but by the end of secondary school and when I started college I stopped caring. People still made fun of me, but it never affected me.