I am 20 years old female.,my problem about my right breast always in pain.So my right breast is bigger than the left and itchy.I have been in a doctor last year but the result of the ultrasound is negative.And this past few weeks I feel back pain and shortened in breath.I have fear that I have a breast cancer or other problem in my breast,cause my aunt died because of breast cancer.So,my questions are..,is this a symptoms of breast cancer or other problems of my breast?Is there possibilities that I have breast cancer or other problems in my young age?What should I do about my problem?