First time, 2 wks practice competing nxt week NEED HELP BAD

[newpolevaulter]

Age: 17
Grade: 11
How long you have been jumping: First year
What pole you are on (length and weight rating): 13 feet/130 lbs

The bar is only at 6 and a half..

this is my first year polevaulting, i have only practiced for 2 weeks but I have to compete in a meet in several days already, im looking to see how I can improve my polevault..

right now when i hold my pole about 3/5 (little bit more then halfway up) I can clear like 7 and a half, however if I try to hold it higher, for some reason I go up (get the height) but land before the bar each time...

http://www.youtube.com/watch?v=ImEio6d6948