Still struggling with the word pre-cancer after DCIS mastectomy

I was diagnosed with low grade DCIS in my right breast in Nov 2019 and had a mastectomy in Jan 2020. I am 38 years old. I saw 2 specialist and both recommended a mastectomy because I am small breasted. Had an expander put in, awaiting for reconstructive surgery which has been postponed due to covid19. I am now clear without needing further treatment. My surgeon/breast care nurse/GP all refer to DCIS as pre-cancer and I struggle with this immensely because I need to feel that the choice I had made was justified and worth it. I lost my breast, it may be small but it was mine. This is not just about losing my womanhood, I felt I lost a part of me that made up the person I know myself to be. Because of this word I don't feel like I have saved my life, I didn't even have cancer. I know I should be grateful that I didn't have to go through radiation or chemotherapy or take any meds but to me a mastectomy is a very drastic treatment. How do you even explain it to other people? Nobody knows what DCIS is unless they have it, do I say I had pre-cancer? Is it wrong to say I had breast cancer? 5 months on and this is still keeping me from moving forward. 

At yesterday's Psychological Impacts webcast, someone asked Dr Tottman this very question and I was basically yelling at the screen "this is exactly how I feel!" So I now know there are others who are just like me. I hope to hear your stories and thoughts about how you are dealing with this particular issue.