Turn around and go through Level 1 and then 2 again. There is so much new stuff coming at you most people can't absorb it all. Even if you only go back to level 2 and redo the first 15 minutes I bet figure out or understand things you didn't catch the first time through.
Remember to take pride in little achievements and know you will hit walls. Walls can be friends they will force you to learn new things. I've been playing guitar for 40 years now and can assure you all walls are beatable.