He supposedly said that, which proved to everyone that he wasn't any kind of a Gawd, because a Gawd does NOT talk to himself nor pray to himself. +5

He was quoting Psalm 22. Check it out. It's an amazing foreshadowing of the events that unfolded during his crucifixion.

While we cannot be sure of Jesus’ motives for saying this, his words may indicate that Jesus recognized that Jehovah had taken His protection away so that His Son’s integrity could be fully tested. It also fulfilled what Psalm 22:1 foretold regarding him.—Matt. 27:46. Hebrews 4:14-15 Seeing, therefore, that we have a great high priest who has passed through the heavens, Jesus the Son of God, let us hold onto [our] confessing of [him]. 15 For we have as high priest, not one who cannot sympathize with our weaknesses, but one who has been tested in all respects like ourselves, but without sin.

That statement in itself proves that he was not god. +5

As others said, it's from a Psalm, which he quoted the start of as a sort of shorthand for the whole thing, which ends on a positive note.

He really said it. In fact the Gospel writers Matthew & Mark ensured there would be no doubt because thw words are the same. The earliest manuscripts have Matthew in Hebrew, and Mark in Syriac. God took his wrath out on Jesus during that time so that all sin could be judged forever. And for that brief time, the Eternal Son, who had always been in fellowship with God the Father in eternity past, felt His wrath so that we wouldn't have to. So here's the option everyone has: either Jesus pays your sin debt, or you do (for all eternity) (Eph 8:9-10). This is the doctine of atonement. Remember, sin has to be accounted for because God is Holy and He must judge it. Jesus offered Himself as the perfect sacrifice, opening the door for anyone to be found "white as snow", based on faith in his finished work on the cross. 1Jn 2:2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world. Paul would write the doctrine for justification based on that in the book of Romans (chapters 5 & 8). Rom 5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: This is forshadowed in Exodus during the celebration of the Passover Lamb. Those that had the blood of the lamb applied to the entrances of thier houses, were spared death, as the Angle of Death would "pass over" each house that had the blood. And he would visit those houses of unbelief. (Exodus 12:21-30)

These were the words of Christ as he was dying on the cross. As He was dying, He bore the burden of shame and guilt for the sin of all mankind who trusted in and who would trust in Him as Savior. Yes, He did mean what He said, because His Father will not look on sin, either.

Keep in mind that Jesus was speaking of His nature as a human being. With Jesus in agony, He simply cried out to the Father. Philippians 2:6 "Who, being in the form of God, thought it not robbery to be equal with God:"