In Shevek's world, people don't really dig owning stuff. They believe in sharing everything to keep things fair and square. Owning things is like a bad vibe, messing things up for everyone. rephrase like a 8th grader with same word length

In Shevek's world, people aren't too into owning stuff. They think it's better to share everything so things stay fair and equal. Owning things is like a buzzkill, making everything bad for everyone.