It's really up to you. It's a big decision about breast augmentation, I'm not saying this because I had it done but my sister thought about it and she said that she felt uncomfortable about her breast size. She and I are the same about a 32A and I am happy with my size. I know this because my aunt has large breasts and she has back problems from it, so if you're seriously considering breast augmentation just remember to keep to a size that is comfortable for you, otherwise you may end up spending more money on a breast reduction later.

However, you may just have dormant hormones, I believe that I have that as well seeing as I'm 21 y/o. I had a co-worker who told me that she was my size when she was my age as well and she told me that she blossomed when she was in her late twenties, early thirties. So perhaps it only is dormancy of hormones but it is your choice but be sure to do it for yourself and no one else.