dear, if we face self pity rare ,its not a big problem , we can overcome it easily may be its the result of any other sad feeling or hurt but if it becomes our habbit its dangerous ,,
some times self pity is due to life exams and challenges but mostly its the result of problems in relations and routine attitude in this case
we should remember one thing that ...if someone have problem with everybody in his life than its mean that problem is inside him.understand the problem and cure it with positive feelings. our life is a challenge and every step is an exam ,if we are looking others what they are giving us we should look that what we are giving them..most of the self pity problems i think can be solve with gratitude ...and practice of gratitude
may be you are not agree but i think like this
everybody is not perfect but everybody in this world have positive qualities in his personality...
and in other things too we should keep an eye on positive..in every bad incident something hidden is positive