Non Cancer Lumps Found

Good evening everyone. Some of you would have read my post on Not Dignosised yet. Today I got the results from my Core Needle Biopsy. All is clear I have not had cancer before. I have a strong family history. Om my mums side my grandmother and 2 Aunts one of the Aunts had breast and Ovarian Cancer. On my dads side my grandmother and 2 Aunts also breast cancer. My dad also has non hodgkin lymphoma not sure if tgat makes a difference. I am heading to a specialist as soon as my GP makes an appointment probably within the next week. I with the support of my husband and my GP am going to ask for Preventative Mastectomy. My results today said fibrocystic non cancer lumps. Am I over thinking this? I am so anxious about getting breast cancer in the future. I am 50 and have alot of plans for the future. Sorry for all my posts but I am at a loss of what to think. Cheers.