The Green Knight
It’s like this for pretty much all of the races. One story arc based on a char creation choice until level 10, a second arc until level 20, then a ‘meeting the orders’ arc until level 30.
Like Ganzicus said, it goes: Story option one for the first ten levels, story option two for the next ten levels, then the order picking to level thirty, and lastly you hit the main overarching storyline which involves your order but your choices have little impact at this point.
Your story? You surely mean Trahaerne?
First story is sorta your character’s first major accomplishment, after the tutorial which is the first achievement that gives your PC fame and distinction. Second story is a past regret (or prefered ventari saying for Sylvari). Third, Fourth and Fifth stories revolve around the Order, mainly the one you choose. The Sixth, Seventh and Eighth stories (which focus upon opposing Zhatian, often using plot devices established and nurtured across all the other stories, even ones not played) is about working with the P—- to prepare an invasion and infinally invade Orr.
Don’t get attached to anyone, unless it’s Treehorn. You have been warned.