No, ‘my’ is not a proper noun. It is a possessive adjective used to indicate ownership or relationship. Proper nouns refer to specific names of people, places, or organizations, such as ‘Michael’, ‘Paris’, or ‘Facebook’. On the other hand, ‘my’ is a functional word that helps to modify a noun to show that something belongs to the speaker. For example, in the phrase ‘my book’, ‘book’ is the common noun, and ‘my’ tells us that the book belongs to the person speaking.