[AquaA]

Okay this is freaky because your boobs look EXACTLY like mine!! I swear it's like you took my pictures!! I'm a 34B and fit into small 32Cs, I also look bigger in pictures than I do in reality so I understand what you mean. I still think you're wearing the wrong bra... Go to h&m and try on their 34Cs that are slightly padded from the side. I just bought one from their new collection and it fits perfectly.

I think close ups gives the illusion of big breasts in pictures, in our case, so take a picture of your reflection in the mirror.

There's no way she's a 34 band size she's thin 34 is fatter back you are right that in no way is there only 1 - 2 inches difference in cupsize a or b cup
Definitely a c or bigger if not the band is far too big for you.

I'm quite thin, size 2 American and a 6 UK... I fit into 34 but specific brands, h&m 34 is a perfect fit but a C since they run small. 32B is too small for me, 32C is usually big so I'm usually a 34B or small 32C in normal brands. Her boobs look a lot like mine that's why I suggest a 34 C in h&m... Honestly not an expert in bra sizes, but I'm just suggesting according to brand. I just try on a bunch of different bras in different shops and get the one that fits best.