just resign your ongoing games, stop playing and turn off all your move notices etc... change your email address to something random nonesensical (or does Russ get fed-up with delivery failures?)
You will always exist as a profile on the site as to remove that would be to leave a hole in the database.
No problems.
Oh.... Correspondence chess silly? Pah!
Some people have no patience. I have met with a few people on this site that tdo like real time games. Just open up invites and loook for some one who wants a 'quick game'. And off you go. As for long games, I too found these a drag to start but i have come to realise that they have endlessly increased my insight int the game. If you look hard enough you can pull some really good things out of what would usually be a 'nothing game'.