As per the comments of this SO answer:
Maybe it's due to your low reputation that you're unable to delete your own answer.
It is because of my low rep. but i think the fact i can't delete my own answers is a bit lame.
I checked the SO FAQ about reputation, but I can't seem to find the minimum reputation one would need before being able to delete own question/answer.
Is there actually a minimum reputation for this? If so, how much is it? And can it be added to the SO FAQ as well to avoid future questions/confusions?