:d heya,
i think if you want to get it done then go for it. My whole life I had always been picked on because of my small boobs, not only that when your 18 and you see a 12 year old wearing the same top as you only she looks better in it its quite depressing.
Of course they hurt at first, but you can only expect so much from having a foreign object in your body and it's stretching the space you already have there.
I got mine done about 6mnths after my 18th birthday and that was almost 2 years ago, I got them done for me and it has made me 100's of times happier and more confident, in fact my boyfriends sister just got her's done because she was un-happy and was excited to find that I had felt just how she is feeling now.
Anyway save up your money because you'll never regret it