Young (18) but Uneven Breasts

Certainly you are a candidate for surgery.  I would probably recommend an implant on the left and either a lift alone or a lift and small implant on the right.  The areola can also be reduced at the same time. Now, realize that not only are no two breasts the same before surgery, as you can see in your case, they will not look the same afterward, but should alot  be better.

Breast asymmetry is very common and surgical correction is possible. In my view, a correction for you is actually a reconstructive procedure due to a congenital discrepancy in your breasts. Some insurance companies cover this type of reconstructive breast surgery. The correction often requires more than one operation. The areolar sizing is definitely correctable. I recommend that you seek a Board Certified Plastic Surgeon in your area with a lot of experience with breast reconstruction.