I have to tell fabricated stories to my Mum (my Dad lives elswhere) simply because of her general views and opinions on the things that I used to do.
I guess that in the beginning I wanted to start going out and doing things deemed more appropriate for older people when I was young compared to my age now. From 15 I would spend time drinking with my mates and generally getting completely trashed.
I thought it was acceptable, fine, though as at the end of the day it wasn't really hurting anyone; I used to work on the principle of "what someone doesn't know doesn't hurt them".
Just less than a couple of years ago now I started smoking cannabis, obviously something which wouldn't go down well with her.; she is one of the most anti-drugs people I know, a fact I didn't realise until I nearly came unstuck with all of my stories whilst snooping through my room (sense the mistrust already) she found a quart of the herb in a drawer.
In a self-preserving measure, recently i've stopped smoking cannabis as this was something upsetting my girlfriend too. I don't particularly want to stop, as it's something I enjoyed, never had a bad experience from, didn't cause me any monetary/social problems in general, but I don't want to have to lie to anyone about it any longer and those that i'm lying to mean more to me than my interest in the effects of the drug.
It was hard work ensuring I never got caught, and since skirting around my secret activities appeared to define me as a different character than who I am.
I lie because I have to now, not because I want to. Sucks, to be fair.