Non Conformist

A non conformist is someone who does not think, act, or behave in a way that could be classified as "normal" in their own social environment. Everyone can be classified as a "non-conformist" in some way because conforming is really someones perception of what is normal or acceptable. The more people who think, act or behave a certain way, the more "those" people feel empowered to tell you "their" way is "Normal". And since normal cannot be quantified, we each have to decide for ourselves to what degree we want to conform.

On mondays everyone wore blue, but Billy chose to wear red because he doesn't like blue, and everyone said he was a non conformist.