Welcome to Adobe Forum,
I see that you have Photoshop Photography Program, purchased in the month of December 2013.
It is still active. Subscription E mail ID CAN NOT be changed.
If you plan to cancel the Photography CC & just keep the Adobe ID & use within U.S.A then you can follow the steps.
Ensure that the email address you want to use is not already associated with an Adobe ID. If it is, you can use the same instructions below to change it to some other, valid email address. This step frees up the email address so that you can use it on your application Adobe ID. You cannot change the Adobe ID email address to an email address already associated with another Adobe ID.
Due to tax reasons, it's not possible to change the country associated with an existing Adobe ID. Follow the steps below as a workaround to create an Adobe ID with the email address you currently use for the existing Adobe ID.