How to change account login to Email only.

I changed my display name, and no longer want any contact with my username. Is there anyway I can change my login so that it is my email? My account was created before that update, and it was created in 05.

 

No sorry to inform you that it is impossible to change a log in username account into a email log in. I could see how it could be useful though, would be nice if jagex made this an option.