To fly a fighter Jet or any other airplane with the Air Force you have to meet both the height and weight requirements set by the Air Force.
To become a Fighter Jet Pilot you have to be between 64 to 72 inches tall when you're standing and between 34 to 40 inches tall when you're sitting.
As for weight you have to weigh between 160 to 231 pounds to become a Fighter Jet Pilot or any other Pilot with the Air Force.