Something is seriously wrong with CiviCRM - Replicating Contacts
You can change the email account associated with a WordPress (or other CMS) account by editing the "UFMatch".  If you're SQL-savvy, the correct table is civicrm_uf_match.  If you want to do it through the web browser, and you acknowledge that this is a tricksy maneuver, you can do this:


Go to Support menu > Developer > API Explorer.  "Support" menu might be called "Help" menu, it switched somewhere in 4.6.
Set "Entity" to "UFMatch", "Action" to "Get".  In "Parameters", Set "CiviCRM Contact ID" to your admin account's name.
Press "Execute".
In the "Results" area below the "Execute" button, note the value of "id".  There are two "id" values - you want the one INSIDE the "values" stanza.  See screenshot below.
Copy/paste the entire results somewhere safe in case something gets messed up!  Better yet, do this on a test copy of the database.


Now that you have the ID of the UFMatch record you want to change, go ahead and enter the new details:


Keep "Entity" as "UFMatch", change "Action" to "Create".  For "UFMatch ID", put in the ID you just found.  
Press "Add Parameter" twice.
Set the "CMS ID" to the WordPress user ID of the account you want to link to.  Set the "CMS Unique Identifier" to the email address of the same WordPress account.
Press "Execute".