Wow, after all the professional, personal, and legal information that's been related here, I feel pretty badly. Is it really that important to go get plastic surgery? I exercise and take care of myself, but have an exceptionally asymmetric face, so might it improve my prospects personally and professionally?
Ignore the studies and anecdata. Attractiveness is substantially a reflection of personality, so it's hard to disentangle them in studies and anecdotes.
Being unattractive can be superficial, or point to deeper issues. In general it'll hold you back to the degree that it points to deeper issues, because people mostly won't care if your face is a bit asymmetrical if they can depend on you and you are pleasant to be with.
Unfortunately plastic surgery cannot usually fix things like asymmetry. Surgery is really very primitive and people like to overestimate its power. It rarely ever makes a person more attractive in reality.
