Massaging your breasts is a good thing, helps to increase blood flow and give you a better idea of how they feel. But sadly there is no real way to make them bigger, there are myths like massaging, drinking extra milk and doing push ups (this will make the muscles around your breasts 'stronger' or 'firmer' and bring them up more though, good exercise too) Only time and puberty will make them grow bigger. Commonly what your mother and aunts breast size is, will be what yours will sort of turn out to be. More of you mothers though, not in the way of 'mum's will be big so mine will be to' They will be roughly the same size. Don't try to force your body to mature, this never works and you can end up hurting yourself