Many people who read Teen Wolf fanfic before watching the show (and trust me, there are a lot of them) end up feeling confused because fanfic is so different from what actually appears onscreen. In season 1, Stiles and Derek only interact a handful of times, and Derek has a relatively minor role. Most of the characters dislike and distrust each other (rather than being the happy werewolf pack you’ll find in fanfic), and the primary focus of the first season is the romance between actual teen wolf Scott, and his girlfriend Allison. The biggest surprise comes when you realize that Stiles is not the main character.
I was one of those people! (:
I accidentally stumbled across a sterek story while I was searching for another fanfic. I found my new love, no offense to hellsing of course.
I probably read teen wolf fanfiction for at least 2 months before even watching a trailer of teen wolf.