Need to learn how to drive..I'm i being over dramatic or is it ok to be upset?

So both of my parents don't drive right now and they can't teach me. So I've had to pay for instructions. I've done four hours and I know the basics and I'm not scared. But my test is in September and I just want to practice as much as possible to pass the test. I need to work on my parking and stuff. So today my uncle came over and I was supposed to drive. So I got inside the car, checked all the mirrors put my seat belt on a started the car. I put the key in the car and started the transmission. I had my foot on the brake and put the car on rear to exit the parallel parking space. I slowly let go of the brake and pressed the gas and my uncle got pissed and made me feel dumb. He said that I let go of the brake to fast, but I know I didn't. After we argued we switched seats and I didn't even get to drive. I'm so upset, he made me feel like a dumb ***. I'm still learning and even if I made a mistake I should be allowed to correct it and learn from it. I'm extremely upset right now.. I feel like I'm never going to learn, driving lessons are so freaking expensive and my test is a month away. I'm i over reacting?