Then, I realized that many people share this in different degrees, why? I recalled how people react to hearing their own voice unexpectedly: most people I know show a sense of revolt, or shock, in such cases. Most people even confess that they don't like to hear their own voice.
So what? Assuming that the observation has some general validity (for a non-zero-measure subset of population! :)
1) Why people tend to dislike themselves? Does it serve any purpose?
2) What can be done to subside the dislike?
I am surprised by how little I could find by searching "self-hatred".
Some interesting related concepts:
Here is an example/discussion of the extreme case, which is not really what I had in mind, I am thinking about a more general, less extreme, negative emotion that people display when confronted with certain aspects of themselves, maybe even some memories ...