you prestiged from 4 to 5, right? And what happens if you earn some more xp? Do you keep staying at level 0?
You're not a noob, you're just so amazingly awesome at this game, you are level 0. Y'see, this is golf, sir.
@Cleopatra has already made a thread about this: http://shellshockliveforums.com/index.php?threads/lvl-0.2852/