I'm 18, my areolas are really big and nipples very low. Is there anything I can do to make them normal? (Photo)

You look like a good candidate for a breast reduction.  The diameter of the areola can be reduced and the hanging breast can be improved.  

A Breast reduction surgery is the option you would require. Seek in person opinions>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

If you wish only to correct for the nipple size and descent then a breast lift would serve you well to correct for this plus give you an opportunity to have improved breast symmetry with respect to shape and size.  If your mandate is also to reduce your breast size than a breast reduction would be more appropriate.