Normally, when it comes to facial attractiveness, more symetrical, average looking faces are said to be more attractive. In fact, even babies are more attracted to symmetrical faces. However, perceiving your own beauty is different than perceiving somebody elses. A recent study found that how you perceive your own beauty may be related to self-esteem and confidence, based on patterns of brain activity. In 2007, a study in perception and psychophysics suggested that symmetry added to the attractiveness of "average" faces, and in 2011, a study showed that people with asymmetrical faces even tend to come from more dificult and deprived childhoods.
As for viewing your own beauty, we compare ourselves to how others look and decide if we are good looking based on how we compare to other "good looking" people. When taken to the extreme, one may be diagnosed with body dysmorphic disorder. People with this disorder are never satisfied with themselves and may even get dozens of plastic surgery procedures done, to still not be satisfied.