That will lead to a solid understanding, a sturdy foundation for the next courses you are to take, a good platform for further development in your professional field, and incidentally, a good grade. It is not hard, only unfamiliar. There are many words that you have never seen before, and they don't stick in your memory at first. There are other words that look familiar, but that are used in special technical ways. These words have precise technical meanings that you have to understand.
Molecules are real physical objects.
They are too small to see, but we will make every effort to help you visualize them. When you understand how one kind of organic compound behaves, you will find that there are similarities between it and other kinds of organic compounds. That's why we expect to learn about a new functional group by relating its behavior to that of a similar functional group we already know about. This rewards the student who looks for connections between what is new and what is already known. It makes things very difficult for the student who learns material in isolated chunks so as to pass an exam and then forgets it the next day.