First diagnosis-Received Lumpectomy or Masectomy

I had thought about having a mastectomy after completing chemo and had gone to the planning session for radiation, but, I wasn't ready to lose my breast and so, completed radiation.  I could have gone back to my breast surgeon and requested a mastectomy and my insurance would have paid for it...and probably if I requested to have both removed.
Knowing what I know now, I would have had a mastectomy in the beginning, however, for me, I needed to go through all the treatments that I had, to now make a decision like that.  In other words, if cancer showed up in my other breast-i would mentally feel up to having a mastectomy.  It is a huge decision to make.  If it showed up again in my same breast with cancer, I would not have a choice.