Is it possible to delete my launchpad account associated with this email address?

I registered my account here quite a long time ago. Since then this account became useless for me, and I always try not to keep such account for safety and privacy. For example, I may change my email address in the future, and then someone could get my account and use it in my name. But that's just a silly example, the point is that I really don't want to be registered here anymore.

Thanks