Is it normal for a 2008 Honda civic Si"s Clutch to go bad with less than 6000...
 

...miles. 1 driver w/ manual exp. This should be covered under my warranty.

No. Take it back to the dealership and have them fix it. If it is covered under warranty, they must fix it.

Sounds like the Honda techs may have been practicing on your car before it was sold. It should be covered under warranty so bring it back to the dealership you bought it from and tell them that it's unacceptable for the clutch to go so quickly.