Opinions Please - San Diego, CA

I am getting saline implants August 8th.  The ...

I am getting saline implants August 8th. 
The lady that has sized me each time keeps trying to get me to go with the 450cc but I am pretty set on the 550cc. 
She keeps telling me I will look matron and freaking me out by telling me all of the stuff that can go wrong with a big implant. 
It isn't the surgeon that's has said any of this. He hasn't been the one sizing me at all. She keeps telling me that my breast tissue will thin out and I will be able to see the implant over time. 
I am 5"1 135 lbs.
I think they will look great and I really want them BIG 

I have a friend that has 550cc and hers looks amazing.
The lady sizing me keeps trying to get me to go with 450cc but I know I will get out of surgery and not like them that small. 
I don't know why she is trying to freak me out of getting the size I want. 
I need opinions....
I really want to stick with the 550cc 
I am currently a 32b

She is also telling me if I go with that size I will end up being a Double G and Victoria secret doesn't make bras for the size I want so I'll have to wear granny bras.... how true is this
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