A.D.
My son is now 18 months and was the exact same way until he was about a year old. From the day he was born, he was scream the second we put him in his carseat and wouldn't stop until he was pulled out and put on the boob (to calm him down). it was absolutely miserable, and it lasted for a long time but now he loves going in the car. Once they learn that they wind up in a new, possibly exciting place whenever they get in, it gets much better. Best of luck to you...and i'm totally with you on being jealous of babies who just drift off to sleep the second the engine starts!