He calls Himself the First and the Last because of His eternal nature as God ( see Isaiah 44:6 and 48:12)The underlined verses below in chapters 1 and 22 show that it is Jesus who is the subject of the book of Revelation and it is Jesus who is to come again.
Then you obviously haven't read Revelation beyond your cherry picked verses, or you need to reread it, because Jesus isn't the only who speaks. God and Jesus interchange in their speaking roles. Only a Trinitarian presumption would think they're the same being speaking. And the First and the Last is simply him stating a similar concept as God would have, not as God himself.
This is an excellent article, even if by a JW, on this "Speaker Confusion trick" which many Trinitarians employ.
Examining the Trinity: AO - Speaker Confusion
John, to the seven churches which are in Asia:
Grace to you and peace from Him who is and who was and who is to come, and from the seven Spirits who are before His throne, and from Jesus Christ, the faithful witness, the firstborn from the dead, and the ruler over the kings of the earth.
To Him who loved us and washed us from our sins in His own blood, and has made us kings and priests to His God and Father, to Him be glory and dominion forever and ever. Amen.
Behold, He is coming with clouds, and every eye will see Him, even they who pierced Him. And all the tribes of the earth will mourn because of Him. Even so, Amen.
I am the Alpha and the Omega, the Beginning and the End, says the Lord,who is and who was and who is to come, the Almighty. Rev. 1;4-8
As you can see, it's God who is speaking there in the beginning.
And behold, I am coming quickly, and My reward is with Me, to give to every one according to his work. I am the Alpha and the Omega, the Beginning and the End, the First and the Last.Blessed are those who do His commandments, that they may have the right to the tree of life, and may enter through the gates into the city. But outside are dogs and sorcerers and sexually immoral and murderers and idolaters, and whoever loves and practices a lie
That's the end of the Angels' message who is speaking for the Father.
. I, Jesus, have sent My angel to testify to you these things in the churches. I am the Root and the Offspring of David, the Bright and Morning Star.
And the Spirit and the bride say, Come! And let him who hears say, Come! And let him who thirsts come. Whoever desires, let him take the water of life freely.
And that is Jesus's conclusion of the letter itself.
For I testify to everyone who hears the words of the prophecy of this book: If anyone adds to these things, God will add to him the plagues that are written in this book; and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the Book of Life, from the holy city, and from the things which are written in this book. He who testifies ti these things says, "Surely, I am coming quickly".
Jesus comes quickly, and so does God. That does not make them the same being. Again, read that article.
Amen. Even so, come, Lord Jesus! The grace of our Lord Jesus Christ be with you all. Amen Rev. 22:12-21
Again, it's a closing of the letter, whereas 22:13 is the closing of the Angels' message of the Father. Speaker confusion is a major problem when reading Revelation.
Jesus means Yahweh [the Lord] is Salvation, Christ means Anointed One, and Immanuel means God with us...all appropriate names for God the Savior of the world.
If Jesus's name means "Yah is salvation", then that would mean they're not the same being.
And Immanuel means God IS with us.
Why would God anoint Himself? The word "Anointed" means one who was chosen to be anointed. God does the anointing for others, not Himself.
With that said, Isaiah 7:14 is not even reffering to Jesus, so it's pointless to even consider that he's called IMmanuel.