usernames

I appear to have finally gotten into the ww.wp.xz.cn site, but it’s not one of the easier things I ever did.

I have been getting notifications from ww.wp.xz.cn that I have two different usernames
and that has been throwing me for a major loop. They are nothing close to eachother. But I originally signed up for an account, I think with wordpress.com, in a class I was enrolled in a few years ago, and chose a password then. I didn’t finish that class, and left wordpress alone for a few years. I’ve recently gotten back to it. I was hoping to change my username, which is apparently not possible, but Ive gotten emails for resetting my password, it seems, the two different usernames each come up (in separate emails) and that is one thing that is throwing me for a loop. I do record these new passwords in emails I send myself, and, to my discredit, sometimes I’ve neglected to save the new password in that page as I’m recording it for my reference.
I finally got in this morning and have saved the ^&$%* password on the login screen, but it seems to me the process of accessing my site is far more difficult than it should be. Does anyone else have these issues? Thanks for any replies.