Sharp pains in thigh?

[maraking]

Okay, so i am a cheerleader and my right leg is longer than the other one and i have had pains in my right knee before. i went to the doctor about it and they gave me a brace. but recently everytime i would do a jump i would get a pain in my right thigh ( that would last a few minutes). thursday at one of our games i did a front hurdler and i got a horrible pain in my leg but i figured it was another one of my normal ones. but i did another one a little bit later and it was even worse (the pain had not quit beetween the two) . it was so bad that i started crying and the pain still has not gone away. it makes it to where i can not walk completely right, and i have a lot of trouble bending, sitting down, and getting up. it is in my right thigh and if i move my leg the right way that sharp pain (as if i was jumping) would come back. If you have any ideas of what it could be . . . .please help?