Hello.... I understand your problem, I think you should know that certain exercise like push ups, high intensity sprints and bars etc can strengthen chest muscle which might help you.... breast size can be increased by augmentation with breast implants which are placed behind the breast through an operation. You need to be comfortable with your breast size and whether you want to undergo an operation to insert the implants.... Kindly consult a plastic surgeon if you want a opinion regarding this.... Good luck...