We go to Mass because Jesus told us to.
catholic.com/tracts/christ-in-the-eucharist
*"Jesus first repeated what he said, then summarized: "
‘I am the living bread which came down from heaven; if any one eats of this bread, he will live for ever; and the bread which I shall give for the life of the world is my flesh.’ The Jews then disputed among themselves, saying, ‘How can this man give us his flesh to eat?’" (John 6:51–52).
His listeners were stupefied because now they understood Jesus literally—and correctly. He again repeated his words, but with even greater emphasis, and introduced the statement about drinking his blood:
“Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you; he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. For my flesh is food indeed, and my blood is drink indeed. He who eats my flesh and drinks my blood abides in me, and I in him” (John 6:53–56). "*
Also, we see the early Church fathers partake in the same mass that we celebrate today:
patrickmadrid.blogspot.com/2009/02/church-fathers-explain-mass.html
*"St. Ignatius of Antioch
Writing just after the end of the first century, only a few years after the death of St. John the Apostle, St. Ignatius gives us a short but powerful indication of the sacrificial nature of the Eucharist. He refers to those who absent themselves from the Eucharist celebrated by the bishop and his priests. The Greek word he uses for the “altar” used in Christian worship is thysiasterion, which means “place where sacrifices are offered.” “Let no one deceive himself,” St. Ignatius warns, “whoever keeps away from the altar (thysiasterion) deprives himself of the divine bread” (Letter to the Ephesians 5:2; A.D. 110)."*
*Epistola Apostolorum
This work, only discovered in 1895, was originally composed in Greek but exists today only in Coptic, Ethiopian, and Latin translations. The Ethiopian version is the most complete and contains a beautiful dialogue between Christ and His Apostles after the Resurrection about the offering of the Christian paschal sacrifice. This passage, translated especially for Envoy magazine, is not found in any English language collections of the Fathers. It’s as though the objections of Protestants against the sacrifice of the Mass where already being anticipated and answered back then:
"The Lord said, ‘You will celebrate the memorial of My death, that is, the Passover Sacrifice . . . at the cock’s crow, at dawn, you will perform My feast of love and My memorial’ . . . . The Apostles said, ‘Lord, haven’t You drunk to the full of the Passover Sacrifice? Is it then necessary that we do it again?’ Jesus responded, ‘Yes, it is necessary, until I come again from the Father’" (Epistola Apostolorum 13; A.D. 140).*
There are a lot of great references to the early Church fathers celebrating Mass in that article. Hope this helps!