Should I Fill These Nasolabial Folds, or Should I Wait a Few Years? I Am 27 Years Old. (photo)

You are right, it is your bone structure.  Your have a narrow face and your cheekbones are flat and narrow.  Cheek implants can help with that but you may not like the change and they are infamous for looking fake.  They first thing to do is to try a temporary filler like Juvederm or perlane in the cheek bone area, not the folds.  Putting it into the folds just adds volume and weight to the central face, not your cheek bones.  If you like the look of the temporary filler, you can go for something more long lasting.  My preference is transfer of your own fat. 

If you start now, you can actually prevent these folds from getting worse and encourage the production of your own collagen along the way, which would have longterm positive effects for your appearance. 

You will immediately feel better about yourself.  

I agree that you have a longish lower face with a relatively flat cheek plane.  This may represent a lack of maxillary projection.  Having cheek filler one a year, is probably a better option than having orthognathic surgery.  I agree with McNeill that you need more cheek volume than nasolabial volume.  You also could use a hit of volume in the lip edges, the corners of the mouth and in the lateral aspects of the labiomental fold.  The change from two milliliters of Perlane, and one milliliter of Restylane would be profound.