I can see where the Monk votes are coming from but I am leaning more towards Thief for you. Many of your "Rate yourself " section answers remind me of thives, I think they are extroverted, very friendly and tend to be a bit of a joker sometimes but can also be more silent and mature when it comes to work. I think thieves are usually very cheerful, many of them are good leaders (Locke, Edge & Zidane ) and how you described your personality remind me of many thief characters.

(http://s28.photobucket.com/albums/c227/ElGenio1/?action=view&current=zidanethief.jpg)