I (first-person singular pronoun)

Me (object pronoun)

मुझे

English Usage: They gave me a book.

Hindi Usage: उन्होंने मुझे एक किताब दी।

To be (existence)

To have (possession)

होना (बिलकुल सही)

English Usage: I have a car.

Hindi Usage: मेरे पास एक कार है।