You can believe what you want. But if they are "the same person" then you have this "same person" talking to himself.
Gen 1:26 - Then God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.”
2 Cor13:14 - May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
Matt 3:16,17
16 And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; 17 and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased.”
Luke 22:41,4
41 He withdrew about a stone’s throw beyond them, knelt down and prayed, 42 “Father, if you are willing, take this cup from me; yet not my will, but yours be done.”
Mark 9:7 - Then a cloud appeared and covered them, and a voice came from the cloud: “This is my Son, whom I love. Listen to him!”
1 John 1:3 - We proclaim to you what we have seen and heard, so that you also may have fellowship with us. And our fellowship is with the Father and with his Son, Jesus Christ. Notice “with the Father AND with His Son”
1 John 2:1 - My dear children, I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father—Jesus Christ, the Righteous One.
1 John 2:24 - As for you, see that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father. Again, notice the AND.
1 John 4:10 - This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins.
1 John 4:14,15
14 And we have seen and testify that the Father has sent his Son to be the Savior of the world. 15 If anyone acknowledges that Jesus is the Son of God, God lives in them and they in God.
1 John 5:5 - Who is it that overcomes the world? Only the one who believes that Jesus is the Son of God.
1 John 5:9-11
9 We accept human testimony, but God’s testimony is greater because it is the testimony of God, which he has given about his Son. 10 Whoever believes in the Son of God accepts this testimony. Whoever does not believe God has made him out to be a liar, because they have not believed the testimony God has given about his Son. 11 And this is the testimony: God has given us eternal life, and this life is in his Son.
2 John 3 - Grace, mercy and peace from God the Father and from Jesus Christ, the Father’s Son, will be with us in truth and love.
2 John 9 - Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in the teaching has both the Father and the Son.
Jude 1 - Jude, a servant of Jesus Christ and a brother of James, To those who have been called, who are loved in God the Father and kept for Jesus Christ:
Rev 1:1 - The revelation from Jesus Christ, which God gave him to show his servants what must soon take place. He made it known by sending his angel to his servant John,
Rev 2:27 - that one ‘will rule them with an iron scepter and will dash them to pieces like pottery’—just as I have received authority from my Father.
This is just some examples of very specific wording regarding the 3 distinct Persons of the Trinity.
One thing should be very clear. No one can be their own father or their own son. Much less both.
God is omnipotent and is not limited in what He does. But, He NEVER violates His own standards, integrity, etc. As such, God cannot sin. And, God cannot be irrational.
These verses, plus many more, show clearly that the Father and the Son are separate Persons who talk WITH EACH OTHER and not One who talks to Himself.
Try reading these verses while keeping in mind that those talking are the same person, and see how rational it is.