Painful lump in left breast, what should I expect?

Hello everyone and thank you for taking the time to read my post!

I had my first ever lump in my right breast 3 years ago, it was easy to feel its shape and it never hurt, and moved somewhat easily. It turned out to be a mass of fribrous tissue.

This time I have a lump in my left breast, and it is very different from last time! It's very hard for me to tell the shape, it doesn't seem to move much, it is farily decent in size, it's become really painful now.

I have a long family history of breast cancer and gene mutation, I am 30 years old.

When my doctor examined it, she said my lump was the "gold star of concern" which wasn't very reassuring hahah.

So I have 2 main questions..

1: Can fibrous masses be really painful? The fibrous mass that I do have on the other side has never bothered me, and never felt painful, sore, or gave me any kind of pressure. The one in my left breast now, has me very tender overall, hurts a lot to press on it, and it also hurts when I don't touch it, sometimes I get random sharp pains in it. It has been a bit uncomfortable to wear my bra.

So can a fibrous mass cause this experience?

Question 2 is: For those who DID get breast cancer, what did your lump(s) feel like before you got diagnosed?

Luckily I am eligable for a free breast cancer program in my state, so I will be able to get screened soon, just want some more understanding in the meantime!