Title says,
What came up on your mind when you first use the internet?
Mines:
“I hope everyone here is nice, so I’ll learn something!”
I realized it was the complete opposite.
BRING ME SPREAD OPEN VAGINAS!
What is hotmail and how does it work?
Heh, ‘barely’ was my experience back then. '97 wasn’t exactly a strong year for the internet. And the best search engine was Yahoo!, how things have changed.
I already had some experience with the internet before I even got my first computer. I would spend hours chatting on the IRC on the school computers or at my friends’ houses, so the first thing I probably did when I finally got internet at home was to see where do I get mIRC and how do I set it up.
I also remember looking for a some info on Mortal Kombat when I was a 12 or so. I went to the library where they had free internet (good lord) and used Yahoo to find some pictures and print them.
When I was riding my bike back home, prints in my hand, I kept yelling “Yahoooooooo! Yahooooooo!”
“This take forever”
Dial-up sucked.
I don’t even remember it.
If i recall correctly, the feeling was: “this is awesome”
Too bad i didnt know what awesome meant back then, but thats how i felt 
^ This
But if I had to guess, probably this / 
I spent most of my time looking for Dead Horse - Peaceful Death and Pretty Flowers on DVD, news and background on Morbid Angel, news on Half Life, playing Team Fortress Classic, and looking for big tittied topless Asian women.
1993
I was in awe of paint and a website that had fractal pictures. I have graduated since then.
I was register a account for an online game, when it ask for email.
I was like “What is email?”
I used it to play Diablo 1 battle.net. Naturally, I downloaded as many trainers as possible and constantly asked people for hacked shit. Good times. :3
I got taken advantage of more times than I can count. Ah, naïveté. 
Porn
“dicks”
That it took forever to get on while an annoying sound was playing and we couldn’t get any phone calls while I was using it.
I remember that. online activity was super fast when you got a 56k modem but you still had to have 2 phone lines if you wanted to talk and internet at the same time. good times.