Please don't worry. I had a hard, unmovable , painless, pea sized lump about 5 years ago. It was there at least 6 months before I got it checked. I was around 18 years old at the time. Everything about it screamed cancer! I got an ultrasound and mammogram. Results were inconclusive but I had to go back in 6 months to see If it had grown. Turns out it shrunk so small I couldn't feel it anymore!