Is my post-genioplasty chin too prominent? (Photo)

I am a 28 year old female, and I had a genioplasty about 18 months ago. My chin was moved forward 8mm (no downwards movement) at the recommendation of my doctor, but now I feel as though my chin sticks out too much. Is this just because I'm not used to seeing my face like this, or was 8 mm too much for my face, and is it possible to reverse if this is the case?