Dear Suzan,
Small breasts and low confidence is like two sides of the coin, they always coexist. First you should acknowledge that you are not alone; innumerable girls all around the world have the same problem. Secondly; you need to accept that there are no medicines, lotions or massage technique by which you can increase your size except augmentation surgeries done by cosmetic surgeon. You may take cosmetic surgeon’s opinion for surgical augmentation. You may do some chest muscle exercises (Pectoral exercises) to make your bust line more prominent. Try to focus your attention on total fitness and well being. This is very important for positive self image.