Okay, let me see if I can sum up this thread in a non-offensive manner.
Is it technically possible to delete an account? Yes.
Will it be done? No.
The administration team does not delete accounts because it would cause disruption to the community. If posts were deleted along with accounts, it would destroy the continuity of threads. If posts were not deleted, who do we attribute them to? A 'guest' user is one option, but what if multiple deleted accounts are present in the same thread? Hard to tell who said what, particularly if the two (or more!) interacted. It is possible to replace the username with something along the lines of "deleted user 00001" or some such, but at that point, how is it any better than just keeping the original username attached to the posts? If not having your username there is a huge concern to you, my suggestion is to see if you can get the admin team to do a username change.
The rest of the personal information in your profile can be deleted, changed or otherwise dealt with.
Now, you don't have a lot of posts, so you may feel that it's fair that your account be deleted, as it didn't have much impact on the community. But that sets a bad precedent for the admin team. It requires questions be answered, such as "how many posts are too many for an account to be deleted?" If an exception is made for one person, there will be three people tomorrow asking for the same thing. Rules are only useful if applied unilaterally, and it's no good to make an exception for anyone.
