I agree with Cougs, get use to swimming with your arms!!
As Lars said, the wetsuit is like a pull bouye. Once you swim in one the bouyancy puts your body in the correct position, thus stops the swimming up hill phenomenen?? This is where your body position is wrong and you find yourself kicking too low in the water. Try to maintain the kick just breaking the water, you will use a lot less energy and therefore find the swimming a lot easier.
But be warned, don't rely on the wetsuit as if the water temp is too warm, they are not aloud.