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Are you a talentless n00b? It's really ok to admit it here, among friends -- you wouldn't be the first player in the world to have overlooked (or been completely befuddled by) talent points. Just take a peek at this post about a player who purposely skipped training his talent points, just to see what would happen. If you read through the comments after the post, you'll find plenty of players who missed training their talents along the way, either through not knowing that talent points existed or after becoming paralyzed by the sheer variety of choices.
The talents you choose for your character can completely change the way you play the game. Your "spec" (specialization) is determined by where you've distributed your points among the three talent trees available to your class. So-called "hybrid" classes such as Druids or Paladins take on entirely different roles depending how they are specced: tanking, DPSing or healing. For other classes, spec is more of a flavor tool that determines how your character goes about doing his or her thing.