Rogues are a fun class to play but not every spec does the same amount of damage.
You can’t change your class from a Rogue to something else, but you don’t have to be Outlaw. You can switch to Assassination or Subtlety. The same websites with guides for Outlaw also have guides for the other Rogue specs. You might find one of those to be better than Outlaw.
Also, Outlaw Rogues are getting a small buff to AOE damage (Blade Flurry) today during maint.