Right from the beginning as a young teen, looking down at my cleavage when trying my first bra was a pivotal experience. It cemented that I did have boobs like all the others in my class were saying on a daily basis. And not only was it conformational, but for some reason I found myself liking my boobs and how they presented and felt in a bra. To this day I have continued to like the look and feel of wearing a bra and looking at my boobs held in the cups all these years and no doubt that this greatly helps in the acceptance department.
Right from the first time trying on a bra, I was accepting that I should wear one and probably wear one for life. Only the issues of navigating wearing a bra amongst others, particularly in the teen years, was the only negative aspect I had to overcome on my own. Otherwise I was full on ready to manage my breasts with wearing a bra even at age 13.