Faye, you are just like the rest of us. Women don't jump, at the very least as well. You just need a lot of practice. It didn't feel right to me either at first. I'm assuming jump back kick, so instructions are for that:
1st. Just jump in place, knees come up.
2nd. Jump and turn 180°, right to left and vice versa. Get used to your body doing this.
3rd. Jump and just turn 90° halfway: first your left side is lined up to the left of the target, jump up, turn right, facing toward the back and lift the right foot. So your left shoulder is lined up with the target, you are facing 90° away (right angle) you jump up with both feet, you land facing the back with one leg up and try doing a small side kick back. Never turn your hips further than facing toward the back.
4th. Same start position, line up on one side of the target, like before, so if you turn to side kick you would hit dead on. Jump up like you have now done alot, bring your kicking leg knee up and reach back to the target which should be right there. Extend out quickly, confidence comes with practice.
Don't jump out further away from the target, go up and down, bring your weight up and through your kicking leg, slight hip thrust. Hit with your heel. Practice, practice, practice, makes perfect. TW