Drill down a bit on how and why your friends' disagreeing with your decision has caused you to waver. You trust their opinion because they know you well? Is it the uniformity of their view causing a kind of peer pressure?
I spent months talking about my decision with my friends, my family, my doctors. I also did a lot discussion with myself while walking. My mother, who had BC at my age and a single mastectomy, was for the decision to go the double. She's loathed the scanxiety, and of course my sister died from BC so we were past any caution on that front. My friends understood less, but were a mixed bag. One very good friend disagreed and it was in listing the reasons why to her in a WhatsApp message that actually clarified the decision for me.
I had an immediate reconstruction, and a subsequent positive test to a genetic mutation which has retrospectively strengthened my decision. I will always miss my boobs, but reducing my odds of a recurrence from high to very low is an enormous weight off my mind. I have no regrets. Sadness but no regrets. K xox