Small boobs need support too especially if you are going up and down steps a lot and any physical activity including just walking. Also a bra is needed when you have tender breasts from period and pms. And of course for the nipple reason lol and a white shirt omg! All girls like padded bras and push up bras too!
not all of them do but I imagine the ones that do, do so because they still have SOMETHING there to support and because a bra puts an extra layer between you and your clothes so if you get cold(if ya know what I mean)the whole world doesn't have to know.
*Small breasted girls have nipples too.
*It's a right of passage so many people like to make a big deal out of. Especially at the "first bra" age. A lot of people (girls and guys) WILL tease you if you don't wear a bra regularly.
*They make your bust appear half an inch larger.
Take it from a very small breasted woman, It sometimes looks gross, and I wear a padded bra because I want to look like a woman and not a boy. I am very self conscious about it. When the first time my boyfriend and I slept together ( on the 7th, we will be together for 12 yrs.) I asked him if he was disappointed about me being small breasted, he said "No" It doesn't make me any less of a woman in his eyes.