As much of a chance as there is of seeing yourself in a sugarcoated manner, I think there's an equal chance of viewing yourself through a cracked mirror - of distorting good parts of yourself and developing a poor sense of self-worth due to flawed perception. Of course, it's more than likely that you can view your good parts more poorly than they deserve and your bad parts more kindly than they deserve. I think the key is to surround yourself with sincere people - friends who will tell you the truth about yourself, positive or negative - and be honestly unoffended by what they say. Others' perspectives, combined with the insights you yourself can offer, are the best way to completely know yourself.