LOL... Most Cis women's boobs hurt during development and/or pregnancy which has a part in breast development
No I'm not an expert, but I have been around allot of women most of my life
I have two elder sisters who were rather popular, they and their friends were constantly on about their female development woes and would also consult with my mom... They would totally ignore me and seem to believe I had no idea what they were talking about
In my personal experience my breasts have hurt and/or been sensitive most of the time
The good news is, the pain and sensitivity is a sign of development and there are a few months of reprieve in between were they aren't quite so sensitive... Also, you naturally learn to not smack them against various things
A kind of booby defense mechanism that develops along with the boobs
Anyway, yeah, they are going to hurt