Me and change?

Though, I usually prefer to say less about myself, I will make one of those exceptions here (The Law of Exceptions at work here). I have always had, infact am having, this image of being a goody two shoes self. People consider or atleast appear, to consider that I have no evil side (read as naughty, corrupt). Whether it is I who has created this impression or they developed it on their own is very much a question to me. I too feel once in a while to allow the devil in me to surface and take over (though only momentarily). But the bigger question is should I have a change of my image? Should I let loose and let the naughtiness in me take over?
The other question is, assuming I decide to change, will I be able to change?
The reason for these questions are that I feel that the people around me have only seen a very small part of my personality. One big advantage of this is that I am always the unknown and that suits me well. What is your opinion?

P.S. :- I will most probably not change as I am not very comfortable with change (especially when change is for the worse). Also this does not mean that I am against change, when it is meant for the better.