I think this is pretty normal. I am 29 female, and I can find little tender nodes near my armpits also. I just asked my partner, and she has them as well. I doubt we all three have breast cancer! Since I have HA and she doesn't, when I find a sore spot on my body I check to see if it is a sore spot on hers as well, and 99.9% of the time it is. My Dr said it has to do with pressure points and sore muscles, and some lymph areas are just prone to tenderness, such as the area between your collar bones and your breasts.