It will get off the ground, but it will takeoff behind the airstrip.
This is because you are not using the afterburner for takeoff. Make sure that you have a key assigned to enable the afterburner. Once enabled, she will accellerate slowly at first then she will start pulling away as her thrust increase's. Apply some trim, approx 5' and the nose gear will start to raise at approx 165kts.
Remember to use full flaps on take off too.