Why do we say "My Jesus" and then "Our Father"?

In the famous [Fatima prayer](http://www.fatimacentennial.com/fatima-prayers) we say "My Jesus". The Decade prayer: > "O My Jesus, forgive us our sins, save us from the fires of hell. Lead all souls to Heaven, especially those most in need of Thy mercy. Amen." But in the Lord's prayer we say "Our Father". It seems that we should use **my** when talking to Jesus but **our** when talking to the Father. Why do we say "my Jesus" and then "our Father"?