I was like you at the begin, I was like how is that possible?? Because as I remember Jesus spoke to his father the day he was arrested, Jesus was showing us how to pray, how to worship God and how we should pray to forgive our sins. About Jesus being God, The body is Jesus and the spirit of God would be the Holy Spirit, You know Jesus soul was spiritual being, that means his mind, his heart, the control center, his personality is God the father's spirit, so Jesus represents the body of God. If you read (Job 32:8) It would say
Our spirit is always trying to unite us with God through Jesus Christ, who is the only way to God.. That means the only way to God, is go through Jesus, so therefore, Jesus is God. Nobody has seen God, but people have seen Jesus. God is a spirit, it's impossible for anyone to see God, God is like a solar flare, as part of the sun. Jesus had a body, God send him to us to show us the right way and die for us for our sins. Also Jesus said:
I am the way, the truth, and the life. No one comes to the Father except through Me. If you had known Me, you would have known My Father also; and from now on you know Him and have seen Him. so what does that tell you? That would tell you Jesus is God. I rest my case.
I hope it gets a clear point of understanding why Jesus is God.