Ugh!

:
Echoing what everyone else has said.. ultrasounds late in the game are
not accurate estimates. They can be
more than a pound off. Also, there is nothing to say that if your baby was ten pounds that you could not push your baby out. Your body was made to birth your baby!
What this means is when they imagine a baby that is ten pounds, they fear things like shoulder dyscotia. If that was the case, it is a rare complication, and there ARE ways to deal with it.
They fear a complication, so it's easier for
them , not for
you, to have you consent to the c/s. That way, they don't have to deal with possible labor complications (which can happen even if your baby is 5 pounds!). Fear of being sued, etc. Only complications from the c/s which they can put off as "life saving". They aren't there to hold your hands afterwards after the recovery, they don't recover with you. Their objective is to see the baby delivered. If you have a complication from the surgery later down the line (like infection, like scar pain) they are not accountable.
As for not wanting the c/s.
please please please don't feel selfish for not wanting it! If your baby needed truly to be born by c/s , I have no doubt that you would go for it willingly. But this c/s is just for the comfort of your birth team. They have not even tried to let you GO into labor.
That's a heck of a thing to put a shadow across the rest of your reproductive life, your life, your childs life for.
You can do this, mama! Stay strong. Listen to your gut instinct.