How we cite our quotes: (Part.Paragraph)
Quote #1
I return to the cafeteria and sit down at the Abnegation table, among the people who barely know me. (1.17)
Here we see early on that Tobias/Four doesn't have any friends. He makes no conversation with the people at his lunch table.
Quote #2
[The Dauntless] are so loud and wild. Can I possibly make a place for myself among them? I don't know. (1.192)
The prospect of having to socialize is scarier to Tobias/Four than jumping down a pit or going into a fear simulation.
Quote #3
"Joining a faction is about more than getting through initiation, you know," Amar says. […] "For most of the Dauntless, they meet their best friends during initiation, their girlfriends, boyfriends, whatever." (2.9)
Joining a faction feels like a fraternity hazing, people going through a series of rituals in an attempt to make friends. Except in this world, it's mandatory.