Practice at home. When you get home from a class, write down the mechanics of the techniques you have learned. If you can't remember, correct it at the next class. Use those writeups to practice at home. Visualize the movements in your mind. Practice includes breakfalls, but be careful. You are more likely to be injured by yourself when you are inexperienced. That is dangerous and non-productive. But especailly the techniques, practice, practice, practice. Muscle memory is more important in grappling arts than others, imho.
Try not to get discouraged. If you do anyway, move on through it. It happens to most all of us. And when we quit focusing on that and just focus on learning and improving what we already know, it will amaze you one day to realize how much you are improved. BTW, that doesn't mean you will suddenly be perfect with all knowledge, just you will realize you have improved, a lot. A need to learn more.