In my experience, it's difficult and down to luck. I am studying with the open university, Mathematics/Physics and I haven't made any friends on the course. I found the WhatsApp group chats to be really toxic and not conducive to support nor friendship. I'm in my late 20s so I don't mind as much as I used to. But as someone with Autism, I understand how lonely it can be - I hope you're able to socialise on the course that you're doing.