The solecism of "My God" is often misunderstood, misused, even unintentionally.
When we say: My wife, my husband, my children, my house, my car, etc. we levy a certain right of possession over the object.
When it comes to "My King", "My Lord", some fear is instilled.
But "My God", not to mention the mixed introduction of vanity, has been meant for something possessive, instead of the God of Abraham, and the God of Isaac, and the God of Jacob, and of all living. My God, the God of Timothy Law. The God whom Christ cried with a loud voice: My God, my God, why hast thou forsaken me?