Dude, “THIS was what He had just done, transubstantiated bread into His body (TAKE AND EAT OF THIS, THIS IS MY BODY)”
It is your assumption that what He did is “transubstantiated bread into His body.”
He was speaking metaphorically.
If you want to believe differently, that’s on you. It won’t bring you eternal life. For that, you will need to entrust yourself to Him alone and not works, sacraments, prayers, etc.
Again, on you.
"The earliest known use of the term "transubstantiation" to describe the change from bread and wine to body and blood of Christ in the Eucharist was by Hildebert de Lavardin, Archbishop of Tours, in the 11th century.[14]
[Comment: more than 1,000 years after Christ's death]"By the end of the 12th century the term was in widespread use.[15]
"The Fourth Council of the Lateran, which convened beginning November 11, 1215,[16] spoke of the bread and wine as "transubstantiated" into the body and blood of Christ: "His body and blood are truly contained in the sacrament of the altar under the forms of bread and wine, the bread and wine having been transubstantiated, by God's power, into his body and blood".[17]
Wikipedia