What's your experience with core biopsy?

I'm 28 and I recently done a ultrasound in which they found a mass and cyst on both of my breasts and locations. The radiologist recommend that I do a core biopsy to make sure that they're benign. She also said they could be hormonal. I would want to talk to my obgyn before going through it. I'm just scared about the side effects like infection, breasts wont look the same or complications in the future. Helpppp.