Play some different classes see which one you like. Hunters, rogues, mages, fury warriors in the past (I know they have been whiny lately), warlocks, shadow priests, catloldps (druid), shaman, retn00b (paladin). Have I listed every class now?
You can get pretty good dps out of any class spec'd and geared appropriately. The defined roles of a class are much different than FFXI. Just find one you like playing.