I just finished Dark Souls 1 for the first time. In the end, I have understood little to no aspects of the story, so I went and watched YouTube videos about it.The video was going through all the interactions and communications that were possible throughout the game, and I found out that I didn't have most of them!
I was actually very patient throughout my playthrough, I talked with all the characters and NPCs that I could find, the only problem is, I couldn't find most of them. Either I was unfocused, or they just weren't thereI didn't meet Shiva, Quelana, and even one of the most important NPCs throughout the game, Kaathe. He just wasn't there. I rested at the bonfire in The Abyss, then I warped out, so I never met him. I didn't meet Siegmeyer's daughter after the Duke's Archive.
Even most of the important places I haven't gone to, such as The Painted World, or Ash Lake, for example.
It's worth noting that I was hollow for the most of the playthrough, and I played completely blind, without watching any videos until I finished my playthrough.
The question simply is: is missing content on your first Dark Souls playthrough normal, or did I do something wrong?