Hi Helios,
I am Jeanette and want to welcome to the site too. The tenderness and swelling are both normal signs of developing breast. I'm not a doctor but I am sure there are all differenr "normal" kinds of nipples out there. The fact that your sound like inverted nipples does not mean you are not normal. My mother had inverted nipples and the only issue they created for her was that she was not able to breast her 6 kids. (yes, I was a deprived baby)
You could probably easily find out about nipples online or possibly by asking a doctor.
Hugs,
Jeanette