my

/maI/ determiner (possessive form of 'intransitive')

1 of or belonging to me: Have you seen my car keys? | My mother phoned last night. | You should take my advice. | I'm sure you don't want to listen to all my problems.

2 used when you are surprised about something: My! What a clever boy you are.

3 used when you are shocked or angry about something: Oh my God! The house is on fire!

4 used when addressing people who you love or like a lot: Goodnight, my dear. Sleep well.