I know that feel, I thought I was the only one in the school a few years ago, turns out some of my other friends all like it. XD It's so painful not being able to spoil stuff for them because they watch the anime.
There is a kid in my PE class that loves naruto, but he doesnt watch the show or read the manga. He only likes it for the sharingan, all he talks about is how he wants contacts for it.
That happened to me a couple of times, once when a friend was drawing some Naruto stuff and some younger guys became aware and then later on in my school years, I found a couple of other Naruto fans, a year younger than me.