I can certainly identify with what you are saying!
My daughter used to lie (although I do think she felt it was the truth at the time!)
She lied to all her support workers at one time, and when I used to call them, in desperation, they seemed very confused and surprised by the fact she had caring parents who were not abusive, hadn't poisoned her food and were desperately worried about her!
Its just some of the character-building stuff we need that plunged us right into the deep end in order to be able to cope for the long term!
That is what I tell myself anyway!