Televison, books, and movies. I devoured them all, believing that they were a good way to figure out how the rest of the people in the world thought, behaved, responded, interacted, etc. That was a terrible mistake. I learned how to talk to people from the books I read nonstop while hiding away in my closet as a child/teen. Real people don't talk like that, and tend to feel that I am condescending, concieted, and self-righteous. Movies and TV were my next attempt to learn social behavior, but the representations on the screen don't match reality. I had trouble figuring out that all these altruistic characters weren't actually representing the reality of the population, just the way the majority of people saw themselves. I still have trouble remebering at times that most people, in situations where it could cause them inconvenience or harm, will only do "the right thing" if they think someone is watching.
And I am still a sucker when it comes to liars. I cannot seem to disbelieve anything a person says (unless it is something I am certain is factually flawed) until they establish a pattern of dishonesty. I have been screwed over by a lot of people, including "friends" and "family" by being fed a load of malarky. I am still teetering on the edge of bankruptcy because my father convinced me he was going to lose his house (when he actually used the money I had been sending him to buy a nex Audi and go on several vacations, including a month long hiking tour of Europe). Afet discovering I had been talken advantage of, I still assumed that there must be some information missing, some explanation or justification. When I confronted him (which took me several months of psyching myself up for it), he just told me that it was time for me to start paying him back for all the money he spent to raise me and "for being a pain in his ass" as a child. I also have three sisters that have all gotten me to pay many of their bills. Luckily I met a girl who won't let my family leech off of me anymore, and will aggressively pursue anyone who tries to take advantage of my gullibility.
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"The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently" -Nietzsche