Lol you don't have to do it at all. Just leave the game if you do not like how it is set up.
The quests are for a story experience, and also to guide the player about each zone. If you have spoiled that story for yourself; then it sucks for you but you ruined a key aspect of their creation and purpose. If you don't like the quests; just grind through them and then dungeon crawl your other classes to 60.