Now, you have three options. One: You leave the account. Log out, don't come back. Two: You leave the account, but you take some time to prepare, basically making sure you will never be able to return again. We will come back to that in a moment. Three: Email the admins, requesting your account to be deleted (which will make it permanently banned, fun, right?), and what a month for them to reply.
Now, on option two: It is easy. And you should do this. Open control panel. Vandalise your profile, mainly by removing all information, closing the comments, disabling everything you can disable, and then write nonsense for both the email adress (remember the @morenonsense.lol) and the password. Writing nonsense for the password is best doe by smashing your entire face repeatedly against the keyboard. When you are done with this, you save the changes and log out. And don't come back. Cool, right?
Either you email the Admins and request for you profile to be permanently banned, or you go to control panel and change your password and email. Just be sure to button mash the keyboard so nobody can ever figure out your password.