Why is my face so flat: I have no cheekbones, would fillers help with this? (Photo)

It's difficult to say without the benefit of a formal evaluation. This is my expertise and a huge portion of my practice. Asymmetry is normal and expected. See an expert who does facial shaping with surgical and non surgical methods to get a comprehensive option. Best, Dr. Emer.

Dear sweetpea000,
Thank you for your enquiry.  
Yes fillers could be used to achieve more defined cheek bones.  Fillers however are not permanent and  therefore this is something that would be on-going commitment if you are to maintain the desired look.
I would suggest seeking a consultation with a certified practitioner.
Good luck and best wishes,
Mr Golchin

I do think that filler would give you some of your cheeks back. I like to use cannulas for this. The filler I would use is probably Defyne but maybe Lyft. Probably one syringe per side is needed.

At your age, loss of fat and bone structure in the face is uncommon but will appear and progress as we age. Addressing your concerns with filler now would be the start of a life long commitment but well worth it if you achieve a look that makes you happy! Juvederm Voluma and Juvederm Ultra Plus would both accentuate the natural curves, no matter how apparent they are now, and enhance the curvature of the face. Proper injection will provide a natural look without the "filled face" look that is less desirable. The new VYCROSS fillers from Allergan/Juvederm, including Voluma, can last up to 18-24 months requiring less frequent injection. Juvederm Ultra Plus in the mid-face can last up to a year in most people. Achieving your ideal level of correction may take more time and filler initially but if you are good about maintaining the filler you should not have to use the amount initially required. These products are hyaluronic acid fillers which have been seen to boost natural collagen production which will help maintain natural cheek plumpness over time- waiting for the "official" study on this to come out- just personal/professional experience talking in that regard. Good luck!

Dermal Fillers like Voluma are good starting treatments to enhance the cheek bones. With appropriate correction results with Voluma can last upto 2 years.

Every face is different, some are flatter, some are thinner, there is a great deal of variation. Also the face is constantly changing to small degrees so that it is never constant in shape. So there is never a right or wrong face, it's just your face.
The issue with trying to change the face through non surgical options are that the fillers last about 12 months, but may not last that long in someone you age. This means multiple treatments over the years. It is also harder to lift tissue in areas where it doesn't naturally go, as this requires more product.
My recommendation is think about what you are looking to achieve and why you dislike the shape of your face. Some people find a few sessions with a therapist to clarify what stye are looking for, and why they want it, helps before any form of medical intervention. 
Kind regards