Practice a LOT more LOL....it will not happen overnight. As dave and I have said, you are trying to add detail when its not ready yet. For wire shots use the Vector renderer...less trouble. For the basic shape you dont need clamping edges, just boxes etc. Work on one half of the car at a time. Like I said I dont do cars but I would do the box shape first, then I would cut mt geo up into its components. Then work on the front quarter, dorr etc one by one BUT not billions of edge loops. Much like a human face you need to block it out then start adding a loop here and there to squeeze the shape out. I wouldnt worry about the grill or any of that until the body is right. That can be put in later.

Cheers bullet