Isn't a pastor blessing the bread biblical? Doesn't someone have to consecrate it?

You are describing something we all have seen our whole life, the one at the front lifting the bread and speaking a blessing over it, and it feels not just normal but reverent. That reverence is real, and the desire to treat holy things carefully is a good desire. Start there.

And you are right that Yeshua (Jesus) did bless before He broke. All three accounts and Sha'ul (Paul) agree: He 'took bread and blessed' (Matthew 26:26; Mark 14:22; Luke 22:19; 1 Corinthians 11:24). But read carefully what He blessed. He did not bless the bread. He blessed God. The Greek is shorthand for the Hebrew table blessing, and that blessing is spoken to HaShem, not over the loaf. So blessing at the table is not an invention, He did it, but it never once ran the direction we now assume it did.

You may even sense that a great deal rides on which direction that blessing runs, up to God or down onto the loaf, though most of us were never taught to ask. That is exactly the hinge.

Here is what to put down: the idea that a blessing lands on the bread and consecrates it into something holy in itself, and therefore that a set-apart office-holder is needed to make it so. A Hebrew b'rakhah (blessing) moves upward, to the Giver, never downward onto the thing. The blessing His friends had said over bread a thousand times is 'Blessed are You, YHWH, who brings forth bread from the earth.' Hear the whole sentence: it is addressed to God from the first word, and the bread appears only as the thing He is thanked for. It blesses HaShem for the bread; it never blesses the bread. Yeshua never blessed the bread itself. He blessed God. You cannot bless an object; you bless the One who gave it, and the gratitude rises to Him. That single grammatical fact quietly undoes every theology built on 'consecrating the elements.'

And the deeper point reaches the office itself. A kohen (priest) exists to stand in the middle, to mediate. But the covenant in the cup is the one where 'they shall all know Me, from the least to the greatest' (Jeremiah 31:34), the covenant of unmediated access. A cup whose whole content is no more middleman does not found an office of men who stand between you and the bread. If anything, it dissolves the need for one.

Do not take it from me. Say the blessing Yeshua would have said and hear which way it points. It thanks God; it does nothing to the bread. Then read Jeremiah 31:34 and ask whether the cup founds a mediator or retires one.