Breast lump since childhood

I sometimes experience sharp pain in my breasts, and in my early 20s, I also had many sharp sensations and lumps, so I went to a gynecologist for an ultrasound. At that time, nothing abnormal was found. Now in my 30s, others say they don't feel any lumps in their breasts, but I still have many lumps. An older sister I know also had lumps in her armpit area, but she was told it was just fat and okay. Is it possible for some people to have so many lumps like this?