I read a quote the other day that made so much sense to me. "Don't let perfection get in the way of success". Your baby is gaining weight and breastfeeding is comfortable and painfree. You don't have a problem. You have success! No need to see shadows where none exist. Under these circumstances the shape of your nipple just doesn't matter. She will grow and develop and pretty soon your nipple will come out round and normal looking - but right now you are doing great!
Gee I wish I'd read this back in the early days! Pity everyone else was telling me something had to be wrong because my nipple wasn't coming out round and perfectly shaped, even though I had no pain at all. Good to know now though