Hey Blazen,
You are very welcome here and it is wonderful that you want to be closer to God.
I'll try to answer your question about the bread and wine.
In the Gospel accounts, at the Last Supper, Jesus said "This IS My Body..." "This IS My Blood..." In John Chapter 6 Jesus talks a lot about Himself, the Bread of Life:
John 6:35-69:
Then Jesus declared, "I am the bread of life. He who comes to me will never go hungry, and he who believes in me will never be thirsty. But as I told you, you have seen me and still you do not believe. All that the Father gives me will come to me, and whoever comes to me I will never drive away. For I have come down from heaven not to do my will but to do the will of him who sent me. And this is the will of him who sent me, that I shall lose none of all that he has given me, but raise them up at the last day. For my Father's will
is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise him up at the last day."
At this the Jews began to grumble about him because he said, "I am the bread that came down from heaven." They said, "Is this not Jesus, the son of Joseph, whose father and mother we know? How can he now say, 'I came down from heaven'?"
"Stop grumbling among yourselves," Jesus answered. "No one can come to me unless the Father who sent me draws him, and I will raise him up at the last day. It is written in the Prophets: 'They will all be taught by God.' Everyone who listens to the Father and learns from him comes to me. No one has seen the Father except the one who is from God; only he has seen the Father. I tell you the truth, he who believes has everlasting life. I am the bread of life. Your forefathers ate the manna in the desert, yet they died. But here is the bread that comes down from heaven, which a man may eat and not die. I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. This bread is my flesh, which I will give for the life of the world."
Then the Jews began to argue sharply among themselves, "How can this man give us his flesh to eat?"
5esus said to them, "I tell you the truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. For my flesh is real food and my blood is real drink. Whoever eats my flesh and drinks my blood remains in me, and I in him. Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me. This is the bread that came down from heaven. Your forefathers ate manna and died, but he who feeds on this bread will live forever." He said this while teaching in the synagogue in Capernaum.
On hearing it, many of his disciples said, "This is a hard teaching. Who can accept it?"
Aware that his disciples were grumbling about this, Jesus said to them, "Does this offend you? What if you see the Son of Man ascend to where he was before! 63The Spirit gives life; the flesh counts for nothing. The words I have spoken to you are spirit and they are life. Yet there are some of you who do not believe." For Jesus had known from the beginning which of them did not believe and who would betray him. 65He went on to say, "This is why I told you that no one can come to me unless the Father has enabled him."
From this time many of his disciples turned back and no longer followed him.
"You do not want to leave too, do you?" Jesus asked the Twelve.
Simon Peter answered him, "Lord, to whom shall we go? You have the words of eternal life. We believe and know that you are the Holy One of God."
When we Eucharist is consecrated at Mass, it becomes the Body and Blood of Jesus. His Flesh is real food, and His Blood is real drink.
In Corinthians, Paul talks about the sacredness of the Eucharist, and how some people are receiving Communion without respecting it or acknowledging it as Jesus, and bad things are happening to them:
1 Cor. 11:27-29
Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord. A man ought to examine himself before he eats of the bread and drinks of the cup. For anyone who eats and drinks without recognizing the body of the Lord eats and drinks judgment on himself.
Jesus is present in the Eucharist.