I had internet access since 13yo, although it was the internet of 1996, so it was way more basic.

And for me it was a place to explore my passions way better than any library in a small city in Poland would allow.

And sure - also a ton of time on internet games / MUDs, chatrooms etc.

And internet allowed me to publish my programs, written in Delphi, since I was 13-14yo, and meet other programmers on Usenet.

On the other hand, if not for internet, I might socialise way more irl - probably doing thing that were way less intelectually developing (but more socially).

It just hit me that I need to ask one of my friends from that time what they did in their spare time, because I honestly have no idea.