Don't lose hope. I thought the same thing about my N9.. turned out that the USB port was just misshapen.

Are the "straight" sides still straight or are they curved? If curved you may be able to gently massage them back in to shape. I think I did it with a Swiss Army Knife with a tiny blade but I can't remember as it was some months ago. Anyhow, it works and charges without problems.

Also, be sure to use the right cable. My N9 won't charge with the Nokia 710 charger or the N900 cable I have and has always been picky about cables and chargers.

Be gentle with the port, it's the Achille's Heel of the phone (other than Elop). Let us know how it goes.