I have this sharp pain near my left upper thigh (groin) every so often when i walk, what is it?

I was playing football/soccer and i kicdked the ball with ma right foot. My left foot was firmly on the ground and as sooon as i swung i felt a sharp pain. Now i feel the needd to walk with caution and every like 2 miniutes theree is a sharp pain. HELP it hurts alot. I am 14 :) please help meeee.