Mine are getting a little better, they were unbearable for 3 weeks. Showering hurt, giving people hugs hurt, I had to sleep in a bra and keep my husband away from them... but they're like 40% better now.
As I understand it, this tenderness is because the milkmaking tissue inside is starting to grow, proliferate, and differentiate due to the hormones of pregnancy (it does a wee bit of this most cycles, but much more now that we're pregnant). It hurts because the cells are growing so fast that everything is stretching from the inside. Once the boobs are all big and ready, it'll stop hurting. I bet that the tenderness and pain associated with nursing difficulty will be entirely different, and not at all related to how quickly/painfully or slowly/less painfully your breasts grow.
But this is my first time, so this is all conjecture. I look forward to finding out! My mom is already starting to give me advice about breastfeeding, such as to start toughening the nipples a little in the final few weeks by gently chafing them with a dry washcloth, so they are a little more used to being touched.
I can't wait!
full time student, crunchy wife to my woodsy man, and mom to 2 homebirthed, cloth diapered, tandem breastfed kiddos.