Everyone is born into the world wanting to be fully accepted and loved unconditionally. Somewhere in the scheme of things, be it the care-giver/some external deficiency or simply the perceivers misconception.. the fear arises that love comes with conditions. Ideally it shouldn't be this way and is not the case for everyone.. but I'd be willing to say that many people have experienced some degree of conditional love at some point. It is not uncommon for a person to begin to see themselves as the world sees them.
Alot of this goes back to how value is established, and many times we see it established through an external standard.
It also goes back to ones ability to reconcile these external measurements with an inherent internal value, which can be very confusing and difficult to hold up in a world where we see people starve, suffer and die every day for power and greed.
I'm just going to add that most of the people I know do not belong to either extreme, they tend to love and hate various aspects of themselves.. and sometimes this can be a good thing because disatisfaction with aspects of oneself can set the framework for improvement and growth which aids purpose and meaning in life.