why do i lie?

that is something I'm still trying to figure out but mostly occurs when i didn't do something or when i did something wrong (no matter the level of it could be from i did not do my job completely to i lied that i fed my cat in the morning) so I'm having a difficulty to know why i am lying and i think that what frustrates me more and i get tired trying to figure it out because i have Trichotillomania and anxiety also so it is frustrating the hell outta me, easy solution that probably 90% would say is "stop doing it" but it's not just that you see this as a habit and its something you have to grow into. i hope i find out within these next days the "why".