I Can Jump start my 2002 But It wont start without jumping it what is it ?

clean the inside off the battery terminals, had 4 cars last week with the same problem, make also sure that the battery is correct for the car. u see the jumpers go on on the outside of the battery connectors that's why it starts, just clean the battery terminals and the cable terminals inside. reconnect and drive away. if not post again and we will sort it out.

Try doing what Schalk suggested, also check the cables for loose connections. have u check the starter? it might be going bad that why it need more power to get it to crank.