While I normally feel that such thinking is paranoia, given who is asking, I think the answer is quite different for you than it would be for most people.
In most cases, such thoughts are often the result of ignorance and fear. They think of a news story from decades ago where some kid thought he was a 14th level Wizard and tried casting Fireball. Look at this theory about Harry Potter and it’s not hard to see how an ignorant person may think that even tangential involvement with the occult will turn one insane.
I am a roleplayer, and have GM’d a few campaigns, but I know there is a VERY sharp, solid line between the games and the real world. I don’t have a datajack. I don’t have Astral Perception. Fireballs come from flamethrowers, not from manipulating mana. Those who know me know that I am well-grounded and have no problems separating reality from fantasy. People may question my morality, but my sanity is never in doubt.
* * * (Warning – “Tough love” ahead”) * * *
However, in your particular case, @talljasperman, it’s possible that they sensed that you already had a bit of a hard time dividing fantasy from reality. Just as sugar won’t give a person Type 1 Diabetes, D&D won’t make normal people lose their grip on reality… but it can be a catalyst for those who already have a fingernail grip to lose hold and drift off into la-la land. The game won’t cause a problem though, it will merely make an existing problem worse. The problem wasn’t getting too deep into the occult. There were already problems long before you got into that stuff.
And I think that is what happened with you, @talljasperman. There was an underlying issue that would’ve caused problems even if you never had learned D&D existed. My father never picked up a Players Handbook, yet he had the same issues you do. It’s merely that your symptoms manifested by latching onto things that others would regard as “occult” instead of, say, thinking you’re an undercover CIA agent on an anti-mafia taskforce or some other fantasy unrelated to the occult and/or RPGs.
As for how you can get un-messed, lots of therapy, probably some medication, and hoping that you’re not part of the ⅓ of those like you that don’t respond to treatment. If you don’t like doctors or don’t want to follow their treatment plans, then you’re pretty much stuck being how you are. And there are no alternative treatments like acupuncture, so you better get used to pills.
@Mimishu1995 And when you can’t see that difference?
@Haleth My biggest objection would be that D&D sucks! Terrible mechanics, no real in-depth world design, restrictive character development… I’d disown the bastard for a total lack of taste! Now, if it were GURPS or Shadowrun, then I would support them, but D&D would be only slightly better than finding out they were a serial killer.