i'm not sure how big my difference is.. i suppose it's about a small b on the right and a c on the left.
my nipple on the left is much bigger and paler as well.. that bothers me most.. and my left breasts is positioned a little higher as well..
i'm quite happy with my body, i mean the usual issues are there 'meh i want thinner thighs, longer legs etc.' but there are days i feel genuinly happy with my body. sometimes even with my breasts.
sometimes though, i take pictures of my breasts (delete them immediatly afterwards of course) to see what they look like when i don't look in the mirror. it looks much worse when i look at them on the photos.
i'm not really considering surgery, as that will not necesseraly make them look better. i just hope that one day they may be able to put in your own fat (but that'll be quite hard as i don't have that much fat) in your breasts and make it stay put.