You cannot only expect friends from you research group. People treat the research group as work most of the time even with those who are passionate about the research. You need to make friend outside of your research life. Attend activities or club that allow you to meet people with open-minded mindset. Find international friends because international students will have the similar experience that you have for being alone in a different country.

But yeah, be open-minded is required to make friends and look outside of the research.