I am finished can have the same meaning as I have finished. If you use am , finished expresses the state you are in, and the structure isn't really passive voice even though it looks like one. There are other similar structures (am/are/is + past participle ) that have active meanings.
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NddadI am an English teacher in Korea. How can I explain this sentence to my students?What do you want to explain? It's a subject (I), a linking verb (am), and a subject complement (an English teacher) with a prepositional phrase (in Korea) that says where you are an English teacher.
NddadThis is passive voice.No, it is not passive voice. In that sentence, finished is an adjective.