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You need to think a bit differently. If you have a fan, and it moves air with a motor, it's pretty intuitive that the fan uses energy to make the air move, right? When a vehicle moves through the air, it also is going to make the air move, the air you must think of as wanting to be stationary, but the car moves it out of the way, and drags some air along with it, this making air move requires energy, the amount of energy needed is considered drag. So, the real name of the game is making the air move as little as possible as you drive through it thus keeping the energy required to make it move as low as possible.
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