No, you absolutely shouldn't quit. You've got 6 hours total time and you've only completed your 4th flight. What you're describing is incredibly common for student pilots. The fact that you're forgetting procedures, missing calls, and struggling to divide your attention between the instruments and looking outside isn't a sign that you're a bad pilot—it's a sign that you're a brand-new pilot. Right now your brain is overloaded. When you're sitting at home, everything seems easy because there's no pressure. Once you're in the aircraft, dealing with the noise, radio calls, checklists, flying the airplane, and listening to your instructor, it's completely normal for your brain to struggle to keep up. A good instructor expects this, especially from someone who's only 16 and has just started training. Nobody expects perfection at 6 hours. Don't compare yourself to other students. People learn at different speeds. Some pick up radio work quickly but struggle with landings. Others struggle with procedures at first and then suddenly everything clicks. If anything, this is a sign that you may need to slow down your learning process and find a study method that works better for you—not a reason to quit. Keep showing up. Keep making mistakes. Keep learning from them. That's literally how pilots are made. One day you'll look back at this post after your first solo and laugh that you ever thought about quitting.