I was a very late developer; we were told in school (where they taught puberty, but not real sex-ed) that a girl should be finished developing two years after she starts having periods, but I was flat as a board until almost three years after that, and I was still just an A cup for almost two years after that. Still, a couple of people pointed out that I wasn't wearing a bra, so I picked up some training ones, because it's an embarassing observation for other people to make. At the time, I hated them. Hated my first non-training ones too, as they itched.
Now, that I'm a bit larger (still small (B, just pushing C (I should be done by now, but apparently my body doesn't work that way)) but larger than before), it irks me if I'm not wearing one. I have a weird reaction to underwire - for the first few wears, my skin turns kind of grey and my chest hurts; after the first few, it's fine - but it's all I'll wear, because I don't like the feeling of others. I found a few comfortable comfortable ones, and I stick to those. I picked up a few "pretty" ones a couple months ago, but one shredded in the wash (opps), and the other two irritate my skin, so I don't wear them either.
I do really hate bra straps though. It doesn't matter how tight I make them, they always start falling off the moment I let go. And since strapless ones always fall on me too (and I refuse to spend all day hiking up the front of my shirt), I just walk around permantely pulling them back up. I wear shirts with longer sleeves to hide it.
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"Nothing worth having is easy."
Three years!