[Drew.]

I had similar problems, i had trouble stalling the car a lot and struggled picking the right gears to be in. One lesson i got so angry and frustrated i was raging so hard my instructor took over the wheel, drove us to mcdonalds and bought me a meal and basically convinced me it was only a blip and all part of learning. I wouldn't give in, it happens to most people, your instructor should probably do more to reassure you.