Hi, You definitely need a breast lift. However, if you haven't had any pregnancies, you may want to wait until you do. Pregnancy and breastfeeding can drastically affect the shape and volume of your breasts. The changes can also be incredibly unpredictable. That said, if you wish to move forward with surgery, consider The Horndeski Method/The Bellesoma Method to reshape and re-position your breasts without the risks/complications and extra cost associated with breast implants. This current method can give you upper pole fullness without implants using your own tissues. I've attached a brief video to show you what can now be achieved using current breast lifting technology. No ugly vertical scars and no implants. I hope this helps. Best wishes and kind regards, Dr. Gary Horndeski
Its hard to give you an exact implant size without seeing you, but a lift plus a 400cc implant could work. I will say that I tend to use a smaller implant because the heavier implants tend to stretch out the lift too soon. Get a few opinions, as surgeons vary in the way they do these operations.