Switch instructors!
Its unprofessional and unacceptable for the instructor to shout at you when you are dishing out the cash. With the new instructor explain precisely what is making you feel apprehensive and nervous. Dont hold back, be honest with him or her so as to overcome the anxiety.
Learning to fly is challenging and its going to take gumption to get through it. After all, we humans weren't designed to fly, especially after just 10 hours!
Erik