What do you do if you want to switch your profile to a Fan page? Unfortunately, a while back it was not possible. However, Facebook finally made the conversion possible.
Here is their support article on How do I convert my personal account to a Facebook Page.
Basically, you are not converting your profile, but creating a new page BASED off of your personal profile. Click this link to go to Facebook to start the process to Create a Facebook Page Based on Your Profile.