Unhappy with round face shape, which procedure is best for me to make face appear more defined, slim, heart-shaped? 18F

Without pictures, it is difficult to answer but you may be a good candidate for facial liposuction as well as a chin implant.

I would suggest you to request a consultation with a board certified plastic surgeon well versed in facial procedures.

Best of luck !

Facial aesthetics are primarily determined by facial bone structure. This is what differentiates each individual person, and makes a person recognizable whether it be attractive or not so much.
Soft tissue coverage tends to be far more consistent from person to person and the major differences are usually more related to bone structure.
Facial aesthetics are genetically inherited from the genetic make up of both of your parents.
Accepting your genetic make up is an important part of growing up and maturity.
Fundamentally changing your facial appearance is not easy or straightforward.
To do this properly requires a cephalometric assessment, and in person consultation with cranial facial surgeons.
Soft tissue solutions tend to give partial improvements at best, but can potentially be useful when applied correctly on the right individuals.
Your post isn’t sufficient for us to make an assessment. Without including a complete set of facial pictures, we can’t begin to make an assessment.
Most young people concerned about their facial appearance, should be treated with reassurance.
Best,
Mats Hagstrom, MD