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confused
vs
confusing

confused is an adjective that describes when someone feels unable to think clearly; or feels bewildered.

For example: He was so confused that he read the instructions.

confusing is an adjective that means something is bewildering or perplexing.

For example: The forum was so confusing that she switched off her computer.

!Note Most verbs which express feelings, such as to confuse, may use either the present or the past participle as an adjective, but the meaning of the participle is often different.

You might be able to remember it using this sentence:-

"If you are confused by English don't worry; English can be confusing."