Yes, it is possible at your age that your breasts could still grow. Having breast augmentation would not inhibit natural growth of breast tissue. It is not possible to know for sure, but the softer feel of the breasts may just be from the body healing from the augmentation.
Loss of sensation in the nipple/areola is fortunately an uncommon occurrence.In my experience, permanent loss of of sensation may be due to stretching of the sensory nerves by using very large implants causing a stretch injury or pressure on the nerves, extent of dissection which can damage the...