U should be accepting ur body the way it is. There no treatment available to increase breast size other than surgery. I don't think u would need surgery

You can wait till pregnancy and lactation as enlargement happens naturally during that period...if no improvements The only way to increase breast size is 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.