Other than here, I don't hear people reference cock size. Here, some men are pretty specific about what they think is small. Big seems to be anything over 7" according to this group, altough you see some who think it should be 9" or more. You are going to find a few women who prefer the bigger guys. So what?
I find men who obsess about their dicks unattractive. If you dated a woman who obsessed about her ass constantly, you might find it unattractive as well. Sure, there's surgery- (not reliable surgery) to enhance a woman's ass, and you might actually love her ass, but if all she talks about is her ass. It's too small, it's too flat, it's just not Beyoncé! It gets very annoying.
On this site, I was pretty tolerant of this dick obsession at first, but now I find it almost impossible to stomach. I like men. When I fall for a guy, I am all in. I adore his body, and his penis! I nuzzle, kiss, suck and take it into my body with enthusiasm! His penis becomes the penis against which all other penises fail. It is perfect. If it is 5", then 5" is the perfect size and anything bigger or smaller is clearly inferior. I know I'm not alone. If a women loves a guy, she isn't fucking him thinking, "wow, if he was just 0.5" bigger".
Give women more credit. If a woman just wants your body or your wallet or your car - move on. If a guy wanted me for those reasons, I would.