It is very painful without now. :)
And I am having trouble to find a bra that is AA-cup. I have smaller than AA, so...kinda flat chest, and hard to pass.
Just like puberty,they need form and training.at smaller sizes,its best to only seek out *training bras* for now.
https://www.google.com/webhp?source=search_app#fp=1548cd794b1028db&q=training+bras&tbm=shop
they are a good fit for smaller people and helps good with future development.they also offer some with padding that can be removed,so it can give a slighter bigger appearance
As I recall, there is a guide to sizing bras on the Victoria's Secret website.
I have used several web site and even had a professional fitting,but still not found a good fit or style.