The books mentioned so far seem to be fairly new (with the exception of Heinlein). What books, if any, might have influenced your younger self?
I did read a book in grammar school about aliens that took over the Earth and enslaved the human race but I think my libertarianism is genetic. It's that ongoing old nature vs. nurture argument.
There was also this relatively brief period in my young adulthood during which some weirdo tried to take advantage of me and convince me I was an angel so he could have sex with me. He didn't get far and I think I've had a finely-tuned bullshit sensor ever since. Come to think of it, my bullshit sensor must not have been too bad at the time since he didn't get very far. It was the second time someone was trying to convince me of something that seemed to be in direct contradiction to actual reality. The first time was my church. Later, I discovered that guy had a little harem of young confused and conflicted men living with him in a big house in Florida. Based on the kinds of B.S. he tried feeding me, I suspect he was doing a good job of keeping them confused and conflicted.