Wondering if I'm taking the right path...

Hey everybody. I'll try to keep it short. Just had a 2nd lumpectomy last week. Diagnosed with DCIS last December. Had a rough time deciding between mastectomy and lumpectomy (took about 6 months). Genetic testing showed PALB2 mutation, but no known familial history. Had a fibroadenoma removed from my right breast 25 years ago (when I was 16); no other issues or testing until these past 2 years. I have dense breasts and thus far most of the spots they've found have been relatively small (like .5cm- plus or minus .1-ish). 1st surgery back in May (DCIS-left, radial scarring-right) margins weren't clear, and had spread to a couple spots outside the duct. 2nd surgery (only on the left) with lymph node testing. Clear margins. Found 1 node with cancerous cells. Awaiting post-op follow up.
Got a few different opinions when deciding on the first surgery. A couple different physicians were conversationally leading towards mastectomy, but said it was ultimately my choice. One very pointedly said I did NOT need a mastectomy at this juncture and that I should reduce my controllable risk factors first (with the lumpectomy and radiation).
I considered the mastectomy for a bit, more so for the peace of not worrying about it anymore. I am not wholly concerned with the cosmetics (2nd lumpectomy was only on the left and now has a little deformity) and would not do reconstruction. But I just didn't quite see the point of - blowing up the whole house for just a few ants.
Maybe I'm in my head about it, but it seems like even though I've killed 100 ants, there's just one more little bugger hiding, and maybe getting bigger. I haven't done any chemo or radiation, but my first thoughts say see this path through, no matter how arduous, and do a mastectomy as a last resort.
On the other hand, I've already had 3 surgeries. I have a gene mutation. While I'm nervous about cutting off part of my body I've had since I was 8, I can't say I'd be mad about never wearing another underwire! Why am I putting off the inevitable? Am I ignoring the signs and setting myself up to get something much worse if it comes back?
Thanks for reading.