Sorry sweetheart, but it's not going to hapepn.It's all genetics, really what you have now is what you'll have forever. There are few things that do make your breasts bigger pregnancy, for one, since you produce milk, the glands swell and increase your size (it varies for everyone).Gaining weight MAY increase your bust size, but it's not guaranteed. As you can see, getting pregnant or purposely gaining weight for the sole purpose of increasing your bust size, aren't really good ideas. Honestly, your best bet is to learn to be comfortable with yourself. If you feel sexy, and you exude that, then others are going to think you are. Confidence is key! The link below gives some tips for small chested women, on how to make their bust appear larger. Caution: They do say that exercise can lift your chest, which is true, but you have to be so careful because if you exercise too much, you'll literally loose your chest altogether and get pecs instead (female bodybuilders routinely look like this).