My and mine, while both possessive pronouns are used quite differently My is placed right before an object. Example: "This is my pencil." "Would you mind getting my book over there?" Mine refers back to a previously known object. "Look at that book! It's mine!" "She thought it was hers, but it was actually mine."

Both words are possessive words but "my" is used right before the word that you want to denote to be yours and mine is not. For exaple: My name, my book, my house, my friends. Example of mine would be: That cat is mine. That notebook is mine. She is a friend of mine.

we use mine to relate the things with us.like I am to wedding on satuday.A friend of mine is getting married.( not a friend of me) whereas we use me to say something that is only yours