You are right in every Biblical sense! This was propheised in the OT that Jesus, the Saviour is to be rejected by his chosen people. That's why the Bible is so truth and that's one of the reasons why we believe the Bible. if only the Jews fully accept Jesus as their Messiah, then the Bible would be all but false.
Another one of your usual circular reasoning with distortion of context of God's Word in OT.
Isaiah 53: – “Who has believed our message? To whom will the Lord reveal His saving power? He was despised and rejected – a man of sorrows, acquainted with bitterest grief. We turned our backs on Him and looked the other way when He went by. He was despised, and we did not care.”
The Jewish sages teach that "whoever saves a single Jewish soul is considered as if he had saved an entire world." Isaiah 53 is about someone who dies for the sins of others. People may have seen Jesus die, but did anyone see him die as an atonement for the sins of others? No! (maybe in psalm23 wishful personal reasoning).
Only if you already accept the New Testament teaching that his death had a non-visible, spiritual significance can you than go back to Isaiah and say, "see - the Prophet predicted what I already believe." Isaiah 53, then, is in reality no "proof" at all, but rather a contrived confirmation for someone who has already chosen Christianity.
Jesus' own disciples didn't view Isaiah 53 as a messianic prophecy. For example, after Peter identifies Jesus as the Messiah (Matt. 16:16), he is informed that Jesus will be killed (Matt. 16:21). His response: "God forbid it, lord! This shall never happen to you" (Mattew 16:22). See, also, Mark 9:31-32; Mark 16:10-11; John. 20:9. Even Jesus didn't see Isaiah 53 as crucial to his messianic claims - why else did he call the Jews children of the devil for not believing in him before the alleged resurrection (John 8:39-47)? And why did he later request that God "remove this cup from me" (Mark. 14:36) - didn't he know that a "removal of the cup" would violate the gentile understanding of Isaiah 53?
Mark 14:36 “Abba! Father, all things are possible for you! Remove this cup from me! But no, not what I want; rather, what you want.” (3 times)
Jesus begged God, His Father, to "let this cup pass from me" so to be saved.
Where is it indicated either in Isaiah 53 or anywhere else in OT that you must believe in this "Messiah" to get the benefits?
Chapter 53 is actually a continuation of the prophecy which begins at 52:13:
Look at the setting in which Isaiah 53 occurs. Earlier on in Isaiah, God had predicted exile and calamity for the Jewish people. Chapter 53, however, occurs in the midst of Isaiah's "Messages of Consolation", which tell of the restoration of Israel to a position of prominence and a vindication of their status as God's chosen people. In chapter 52, for example, Israel is described as "oppressed without cause" (v.4) and "taken away" (v.5), yet God promises a brighter future ahead, one in which Israel will again prosper and be redeemed in the sight of all the nations (v.1-3, 8-12).
Chapter 54 further elaborates upon the redemption which awaits the nation of Israel. Following immediately after chapter 53's promise of a reward for God's servant in return for all of its suffering (53:10-12), chapter 54 describes an unequivocally joyous fate for the Jewish people. Speaking clearly of the Jewish people and their exalted status (even according to all Christian commentaries), chapter 54 ends as follows: "`This is the heritage of the servants of the Lord and their vindication is from Me,' declares the Lord."
52:15 - 53:1 "So shall he (the servant) startle many nations, the kings will stand speechless; For that which had not been told them they shall see and that which they had not heard shall they ponder. Who would believe what we have heard?" Quite clearly, the nations and their kings will be amazed at what happens to the "servant of the Lord," and they will say "who would believe what we have heard?". 52:15 tells us explicitly that it is the nations of the world, the gentiles, who are doing the talking in Isaiah 53. See, also, Micah 7:12-17, which speaks of the nations' astonishment when the Jewish people again blossom in the Messianic age.
53:1 "And to whom has the arm of the Lird been revealed?" In Isaiah, and throughout our Scriptures, God's "arm" refers to the physical redemption of the Jewish people from the oppression of other nations (see, e.g., Isa. 52:8-12; Isa. 63:12; Deut. 4:34; Deut. 7:19; Ps. 44:3).
53:3 "Despised and rejected of men." While this is clearly applicable to Israel (see Isa. 60:15; Ps. 44:13-14), it cannot be reconciled with the New Testament account of Jesus, a man who was supposedly "praised by all" (Luke. 4:14-15) and followed by multitudes (Mattew 4:25), who would later acclaim him as a prophet upon his triumphal entry into Jerusalem (Mattew. 21:9-11). Even as he was taken to be crucified, a multitude bemoaned his fate (Luke 23:27). Jesus had to be taken by stealth, as the rulers feared "a riot of the people" (Mark 14:1-2).