Well, the idea of world-wide communication has been around for a long time. I believe Samuel Morse sent the first telegraph in 1844, and of course there have been postal services of a kind since ancient times.
However, the first idea of the Internet as we know it could be attributed to J.C.R Licklider who talked of a global network of computers in which everyone could access information and data from any site. He referred to this as the 'Galactic Network'. This was in 1962, so it was a pretty radical idea in the middle of the 'Cold War'.
Then there was ARPANET which came to fruition in 1969, and had quite a lot to do with the United States Department of Defense. ARPANET laid down the technological foundations for the Internet, so the driving force behind the Internet was never quite as innocent as it seems.
Yet, the idea for an uncensored medium for free speech and the liberated expression of ideas and sharing of knowledge was embraced by the idealistic 'Hippies' of the seventies. and perhaps somehow, in the very early days of the Internet, we sort of believed that is what the Internet was.
Therefore, ideas about a wonderful information superhighway where art, culture, ideas and knowledge can be shared, and the need to provide and access information quickly for the purpose of defence were around long before the Internet entered the public domain. And of course, porn, dark content and harmful and offensive activities have always been part of society. The Internet, just provided a global audience and less traceable footprint.
By the way, I was introduced to the Internet in about 1995, when I was in my mid-thirties. I was engaged in research at the time, and I loved this new way of working. By today's standards, the Internet at that time was unreliable and limited, but the rate at which it has progressed is phenomenal.