It's not easy when you work in an environment where relatioships are already consolidated. It takes time and patience. Do you have any way to make yourself more 'visible', e.g by organizing events/ seminars for PGs in your department? That's a great way to get in touch with other students and members of staff. The rest come along with it.
Don't feel afraid to make the first step, and let me know how you get on!

Hi Silver,
I am new to the forum, but when I read your message I felt I had to reply.
I am very much in the same situation with my supervisor. She would behave in the same way. Presenting papers at conferences? You have done that already. You want to publish something? There is plenty of time! Actually, You work too much and should take a holiday!
As you can see you are not the only one with this problem. I am not going to surrender so easily though!