Confused means you’ve reached the edge of what you know. That’s where the new stuff is.

Confusion has a location. It turns up precisely at the boundary between what you have understood and what you have not, which makes it a reading on your position rather than a comment on your ability. The muddled feeling is a sign you went far enough to find the edge.

When you notice it tonight, do not back away to the easy part. Write the sentence beginning with what you do not understand and finish it as precisely as you can. Take that to a teacher or a friend, since it is a far better question than saying the topic is confusing.