Lynsey im the same size as you and in an ideal world I would like a B cup but im happy as I am, if people dont like it its not my problem. It makes me look young sometimes (im 20) but im not that bothered I dont usually wear padded bras either I find them to look too false. I just wear normal bras.
There's a brilliant bra shop in HK that sells bras that actually fits your breast size, improves your posture and encourages growth (seriously). I have never worn a more comfortable bra in my life - it actually fits, unlike all the crappy ones they have here. I was a size B over here, but now I'm a size...well, I'm the fifth letter in the alphabet.