I had never thought much about my breasts until the last 5-7 years.  Previously a pretty average 32C, never drew much attention or caused any issues.  Never caused pain or overly sensitive.  I bought any bra I liked, never trying it on or worrying about fit.  Seems shocking now.
As controversial as this is going to sound, I never could get into the breastfeeding thing for a few reasons, not the least of which my breasts are sexual to me.  Breastfeeding was also extremely painful, though I did make it 30 days...
Now I am a 34D, getting older, wear more fitted clothing (as is the style).   Breasts seem to draw more attention, in many ways look better, I can appreciate more now.  I am very particular about daily bras (sexy, wear for short time bras can fit poorly and I can spill out 

 ).  I am careful about clothing choices, some shirts make me look like I am "all boobs", not attractive or the look I am going for.  I would like my breasts reshaped, (and, like many, one is slightly larger than the other) but not enough to consider surgery unless I win the lottery or it's important to my man.  I tend to think growing old somewhat gracefully is important.  
Oh the things we ladies ponder...