Ppl don't like it. They have a tendency to get mad.
Why we shouldn't feel sorry for ourselves?
The majority of people I see who "feel sorry for themselves" would rather do that, than actually do the work required to change their situation.
Well, sometimes it is appropriate to do so, but generally not long term.
As some might say, "Don't sit too long on the pity-pot."
Whatever is done is cause and effect means self created. Best would be to change the modus operandi to desire results.