Yes, I've decided that my immediate deletion would be for the best. If possible, how do I do it? I guess I'm still thinking about it, but I think I should.

Did you not see the thread with the same topic not 4 lines below yours? T_T

Basically you can't delete your user account. You just have to stop using it.

If you need the temptation removed you can ask an admin to freeze the account for you so you can't get into it anymore, but I don't think there's a way to get rid of it completely.