Breast lump??

I found a hard immovable lump in my left breast about 2 weeks ago. About the size of a dime but it's not perfectly round. I had an ultrasound a couple days ago that came back normal. The ultrasound tech could feel the lump but couldn't find it on the scan. But it's soo painful (They wouldn't give me a mammogram because I'm only 17). I have an appointment to see a surgeon on Tuesday. I'm just so scared because breast cancer runs in my family..