How to get bigger breasts?

my breast is not that much big. it looks very small, am 21years. can give good tips for that

I think it si not important how big is your breast...important is how looks your all body...small breast could be ok

 
Also, having small breasts means that you won't suffer some of the problems that large breasted women have. Everything from sore backs to maybe a less risk of cancer of the breast.

Besides, there are many men that prefer small breasted women.

Well it depends how much money you are prepared to spend.
If the answer is not much then the only things you could try are breast massage. If you need links to instructions funmail me. Some studies have shown that it can increase size, firmness or give them better shape but don't expect miracles. Some people suggest papaye but I have no idea whether it make much difference! You could just try gel bras or chicken fillets but I can understand why you wouldn't want to!
If you are prepared to spend more money then there are breast enlargement creams (best accompanied by breast massage), breast enlargement pills (you can get some off ebay with garentee's etc. and I would suggest only getting the ones with garentees because occasionally they don't work) also there are breast enlargement machine kinda things that you could try and then of course, there's surgery. But all of these things are pretty expensive (£50+)
Well hope this helped x

Why do you want them bigger?

that is ok but I tried to massage, but better I can do massage myself only more than 2 days, after that I cant, because feel bad and not interested

Honestly there's not much you can do then! I've looked for so many answers on this. The pill does actually increase a lot of peoples cup size by 1. Somtimes people just don't stop growing and sometimes it doesn't make a difference to your boobs but it's only worth it if you have sex regularly or have bad period pains anyway!