So you've posted a question you're not happy with and don't like that you're copping flak for it, and now wish for it to be removed. You have a few options here:
1. Leave it
It is not fair to simply remove content that you no longer like. The functional and spiritual nature of this site is that it's community owned (or more specifically 'StackOverflow owned'). As such, once you've put the content here, it no longer belongs to you, but to us; the community, as a whole. The only reason that your name is attached to content is for attribution purposes (rep is a side issue related to incetivising people to donate their content).
Simply not liking something you've posted now is not reason enough to remove it. As Animuson et al have said:
You should be willing to stand by all content you contribute to our network. If we notice a specific user continually requesting their name be removed from posts, that is a strong signal that you are not willing to contribute to this community in an effective and meaningful way and you may find yourself suspended from the site. We are not a platform for you to post or say whatever you want and then turn around to have your name removed from it.
So I suggest you suck it up and deal with it.
2. Disassociate the question from your account
You are in fact able to disassociate posts from your account. Simply:
- Click on 'Contact'
- Found at the bottom of every page
- Describe your problem
- Be sure to be specific; make sure you put a link to the actual post
- Include a good reason why you should be disassociated from the content
Alternatively, you can raise a custom 'flag for moderator attention' on the post and request that a moderator perform the disassociation for you.
By the way, this simply removes the attribution that was applied to you, everything else remains in tact.
3. Ask a moderator to delete the content
This is highly discouraged, removing content on the sole basis of 'I don't like this; it's giving me downvotes' is not a fair use of this site. Even some 'bad content' is still good content to leave in place. Also, moderators shouldn't be spending time removing content that people no longer 'like'.
Having said that, you can apparently 'flag for moderator attention' and hope that they agree with you and can delete a post for you.