without changing my psn id?
You can change the email, just go to Account Management. Then it will say Account Management, and Transaction Management, click Account Management. Now in Account Management it should say ''Change Sign-In ID (E-mail Address)'' click there and follows the steps process when you click 'Change Sign-In ID (E-mail Address). You wouldn't be able to change your PSN ID.
Is that possible to do not on your ps3 (Change email)?
It is possible to do it on a PC, if that's what you're asking.
Sign in, then click the link to change your sign-in e-mail address.