Selective Truth....

Very often police or the civic authorities of the city pick me up and process me under various systems.They claim those systems have been created for my convenience and safety.But i feel those systems have been created to keep me out of system.
They ask where have i come from.They want to know who am i.They want me to prove if i actually exist.
When i say i'm from this very city,that i have been staying here for several years,they don't believe.They ask if i have any document to support what am saying!
Whenever i attempted to get a document made,they asked if i had any other document that would support the claim of my existence.
Whenever i tried getting that 'any other document', systems there required me to produce yet another document in order to make me eligible for this 'any other document'.
Caught in this cycle of evidences,i failed to prove existence of my being even once.
Everytime my words are met with suspicion.Am never trusted.I'm treated like this worthless person who deserves to be not-trusted,someone who is suppose to be telling only the 'lies'. And i learn that the proofs for my existence are the documents that i have failed to acquire.
But when i tell the same authorities that i'm from another city or state,am not asked any further question.What i say is never doubted.Nobody asks me for any document to ascertain if i am telling the truth.
Every word that i say is taken as complete truth and very frequently i find myself in the huge numbers that these authorities project repeatedly and claim to be struggling with.
But i don't understand these numbers.I don't understand why do they say i am from some other part.I don't know those regions.Because i have been in this city for so so many years.
I don't remember being anywhere else.
Who am i?
I'm a homeless person who has been sleeping in this particular corner of this very street for almost a decade but still has no permanent address.