Nipples hurt when pressed on

Hey, been on estrogen a while and have had some noticeable breast growth but I noticed a while back that it hurts quite a bit when pressed on. I found out because someone accidentally pushed there and after that happened I did it myself to check if it hurt just because they did it too hard or not. It hurts even when you push only a little and both hurt but left hurts more, it's only started happening after I started taking estrogen.

I haven't been able to go to a doctor to get my breasts checked out but I wanted to see if anybody here has had this issue and if it's normal or something I should worry about.