I have a breast pain, am very much suspicious that it might be one of breast cancer symptoms.

Unlikely: At 27 breast cancer is not likely diagnosis , at your age breast ca is rare, most likely you have fibrocystic diseases which is associated sometimes with pain . Please see your doctor after examination & tests will tell you what it is and gives you mental relief.

Probably not: Breast pain is not a common symptom of breast cancer. You should discuss your concerns with your friendly primary care physician.