Interesting WingCommander, I too disliked "witness girls", they were/are exactly as you say, always looking for the "MS" or "Elder" or bethelite. Stuck up, self absorbed etc, you named it. My "first" was with an older witness woman, she at least had some maturity to negate the other crap. It all ended the same though, witness chicks = lame.
Confliction, to add to the good advice already mentioned, the only way you'll get deprogrammed is to start hanging out with worldy girls. Don't be afraid to talk to them when the moment arises, a simple smile and a simple hello is all that you need to say and the possibilities are endless. Just be yourself and don't be quick to jump in and have sex with the first one that gives you attention. If you do, just be safe and use condoms.
Good luck and be safe!