My digital camera memory stick WONT fit in my hard drive??? what can i do???

can i buy a extension???

You can buy a $10 - $20 plug in adapter that will fit in your computers USB port and that will accept your Memory Stick

Memory stick? Like USB thing? Do you have USB port? But yea you can buy memory card readers, USB adapters of all sorts.

get a life

No memory card or stick will ever 'fit' into a Hard Drive. The card itself needs to be plugged into the USB port of your PC. This is done using a card reader (you need to buy one that is suitable for the type of memory card that you have). Or you can connect your camera to the USB port using a mini USB cable, which should have come with the camera.
I suggest you actually read your camera's user manual, which will explain exactly how this is done.
good luck...

use the usb cord that came with the camera
download the pictures with the cord