In roleplaying, one's own character is never the center of the story -- this is true. But from another perspective, your character is always the center of the story -- and this is also true. It seems like a paradox, but it's actually a way of understanding your own relationship to the world.
In most stories, the main characters are usually the ones who have the most impact on the world around them: they are the heroes who save the day, fall in love, and make the choices that determine the ultimate outcome of the plot. In a way, the whole story circles around them, like planets around the sun. The structure of Warcraft lore is built with the stories of characters like this, whose choices made the World of Warcraft what it is today: Arthas, Thrall, Jaina Proudmoore and the like.
But the roleplaying community of imaginative characters is not such a centralized system. When immature roleplayers fail to understand this, they end up with a chaotic mess where everyone wants to steal the spotlight. But mature roleplaying environments are quite the opposite: they are cooperative rather than competitive, and quite unlike traditional storytelling patterns. Where traditional stories are like a solar system, with main characters around which all the other characters revolve, roleplaying in WoW it is like the expanding universe itself: a web of interconnected stories and characters in which the center appears to be nowhere and everywhere at the same time.