If the plane takes off again when you apply elevator (asuming the other people on your field use this technique) I would think you have to much speed or applying to much up elevator.

I don't know your throttle settings, however, moments before touchdown, cut throttle to idle (if not already so) and start to apply a little up elevator. If all goes well, the plane should float in. If it goes up, you have to much speed.

As one put in another post : "remember elevator controls speed and engine will controls altitude"

I know does sounds strange, but I've read the exact same thing in the MS Flight Simulator Manual. On final approach, you can reduce airspeed by providing up elevator (increased drag) and your throttle is used to control your descent rate.

Remember, landings are the most difficult part of flying !