My (pronoun)

1. Used to indicate that something belongs to or is associated with the speaker.
2. Used to refer to oneself as the object of the verb or preposition.
3. Used to refer to a close friend or family member.

Origin:

Middle english, from old english mīn; akin to old high german mīn mine.

Examples:

1. This is my book.
2. My name is John.
3. Can you help me with my homework?
4. My mother is a doctor.
5. I'm going to see my sister.