<human>: Can you condense the text into a few key points?

26/f engaged to 29/m. Basically, I am 1 in a line of his 5 or 6 brunette/redhead big girl types with glasses. He definitely has a type. He also fetishizes Asian girls but I try not to think about it because yellow fever is creepy to me.

Here's the thing, I am a plus sized girl with long brunette hair and almost check off all of his boxes except for my bust (44 DDD) All of his exes were cartoonishly busty, like if Jessica Rabbit was plus sized - at least G+ cups, I'm sure. He made a couple comments a few weeks ago, and I finally got fed up and said "Well is sex that much better with a girl with big tits?" and he shrugged and nodded his head.

What do I do? I am literally about to marry this idiot and I feel so self conscious and defeated. My boobs won't get any bigger, and I would never have surgery to please a man. It has messed with me so mentally I can't hardly get off at all anymore. He has no problem with me sexually (but I figure if something is wet and tight a guy will get off anyway). 

I just lay there and think of how inadequate I am and doing him a disservice if he would rather have one of his old big titted exes, or maybe a new busty girl will come along, who knows. I think that is the reason he doesn't try very hard or is very eager to get me off because I am not as physically appealing. I've gotten off with him 3x in2 years.

How can I get over this? Should I say something to him about what he's said or implied? I guess I could be nasty and say "Sex with a big dick is great but here I am with you.", but unlike him I don't want to hurt anyone's feelings. Its even overflowed into my self pleasure time, what used to take a few minutes is a 15+ minute job now, just for me to get off myself - forget him trying to get me off ever at that rate, if he even would.
<bot>: I am not my fiance's physical type, he let me know, now our poor sex life is seriously suffering, what can I do to help the situation?