I am 27 years old. I have a lump about the size of a dime under my left breast about where the breast and the breast bone meet. I had an ultrasound done however the nurses made me feel stupid because of my age. They told me I was doing my breast exams wrong and showed me how to do them different. Now that i do them the way they told me too I still feel this lump. I'm afraid that the ultra sound could have been wrong or they just didn't really look becuase of my age. Could there be a possiblity that the lump is just forming and its not showing up as cancer yet? Or should I trust the ultrasound?