I had a similar thing with my first job, (though it wasn't fun), just an undocumented, unintuitive system, plus pretty introverted team, so not very good at helping. I was unproductive. When I did ask for help it was terse explanations so they could get back to their own work.

Changed jobs to a more extroverted group and got on a lot better.

At the time I had thought it was all my own fault, but looking back on it, it was very poor management.