What the heck is going on with this BC thing????????

What is statistically supposed to be a risk such as early menarche, (first period), no pregnancies, little or no breastfeeding, overweight, alcohol, family history...(to list a few) certainly didn't apply to me. First period age 14, three pregnancies, fed my second child for 2 years 4 months, fed my third child for 2 years 1 month. (First baby...a long story, n/a here. Weighed between 50 kg and 60 kg since late teens. (diagnosed at 57), non drinker apart from champers at weddings and so on. No significant family history except for one maternal aunt who had breast cancer, but died of a stroke. Only on the pill for about one year and never had HRT.