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Given the following post, respond as if you're commenting on Reddit:
human
Grad school peer behaviour

Last year I got accepted to a rather prestigious program with a full scholarship. It's super interesting and I am truly enjoying the work that I do.

However, I noticed that most of the people in my group are extremely secretive about the topics they're working on, resources and conferences. When we started, I was happy to discuss ideas, share materials and information about our field.  Around 3-4 months into it I felt it had become too one-sided and I stopped. This was also prompted by the fact that when I was looking for information on a particular subject, one of the other students refused to provide any, saying that we should not talk about stuff like that - although he had no problem getting info from me. 

Is this really true? Are we not supposed to be working together on projects, sharing insight, in general being helpful to each other? Is all academia a rat race or just my group?

At the moment, all I do is work on my dissertation and talk to my supervisor. It feels extremely lonely. I like talking to people and bouncing off ideas. 

Do you have any good advice as to how I can become part of a community that is more dynamic and into sharing ideas?

Thank you.
gpt
This is so fucking toxic, and not at all how I've seen graduate students behave in any tier of institution.

While there is always an element of competition, research is also incredibly collaborative. This is a terrible culture and your PI is either shit for encouraging it, or shit for not noticing it and rooting it out.

This kind of mentality across a group will *only* get fixed if the PI is interested in addressing it.