How to make my bigger?

I'm 14 and my s are tiny...and i started my period when i was 12. All my friends have big and are the same age, and started when they were 12 too!!! Please help me... i dont want to take any pills or offers from tv...and plastic surgery is DEFIANTLY not gonna happen....Any tips? I've heard that s are ade of mostly FAT...so should i eat alot of fods that have alot of FAT in it? PLEASE IF YOU HAVE ANY TIPS EVEN EXERSIZES WOULD BE HELPFULL!!!!!