I knew that my sister and I had been BF and that my family in Central America were all BFer's, but didn't really get exposed to it growing up (I didn't ever meet my CA family till 2003). There was one family friend, who my mum reliably informed me was vulgar (they were atheists and my mum must have confused it with anarchism, and blamed anarchism for this behaviour) because she breastfed in public. "It's normal in Spain, but we're in Australia for goodness sake", the implication being that we are more civilised and keep our naked bodies out of sight. Thankfully, by the time I did have a child, I was well over the taboo about feeding in public. I never did subscribe to my mum's feelings on that one!!
Later in life, when the partying stopped, I joined the fire brigade, and it just so happens that the brigade members' partners are all BFers. So, when they were having babies a few years ago, I got quite a good dose of BF talk, so in the space of 4 years, BFing had become totally normalised. Not only that, at least 2 of them were extended BFers. By the time I was preggers, I knew that I would be doing infant-led weaning - whereas, had I thought about it at all 6 years ago, I would not have known that not weaning your child is actually a more beneficial choice. That said, it did always bother me that animals needed to be 'weaned'. As soon as I knew what that meant, as a younger person, I wondered why it had to be done if there weren't any humans to enforce all this weaning in the wild for these animals.
For me, my BFing influences have converged over time - mainly external, but also these niggling questions about animals in the wild!!