Breast cancer symptoms?

I'm 17 and since November I've noticed a change in my left breast. At first it was just random nipple discharge and a lot of discomfort but lately it's escalated to a lot more. I'm constantly sore and I've noticed a really hard and noticeable lump. My nipple seems to have flattened quite a bit also. Like I said, I'm only 17. What are chances that I could have breast cancer?