to make someone feel that they cannot think clearly or do not understand:
I understand the text but the diagrams are confusing me.
to think wrongly that a person or thing is someone or something else:
People might well confuse the two products.
confuse somebody/something with somebody/something
I always confuse you with your sister - you look so alike.
Donald Regan, not to be confused with former President Ronald Reagan
to make it even more difficult to think clearly about a situation or problem or to deal with it:
He kept asking unnecessary questions which only confused the issue.