If the trinity is Christian , Who was Jesus speaking to at Luke 22:42 ? "father..not my will, but yours" ?

It seems like you are having difficulty in "wrapping your head around" (as our Pastor would say) the understanding of the TriUnity..don't feel bad - due to the limitations of our minds, there are things that we will not comprehend until we are before our Lord, and then will have clear understanding..Maranatha :}