When my D went to college, something similar happened to her. She had specifically chosen a college that none of her friends from home was attending but when she got there, she found she missed them. She went to the counseling center, where she was told that she is not the first, the only or the last person to be homesick and question their choice. The advice she got was to find a person sitting alone at each meal, approach them and introduce herself and ask to join them. Sometimes, she was rebuffed but she also wound up making her very best friend at the school that way. She ultimately got a job on campus as an ambassador, became an RA and is a very happy and active alum. She still has her core group of HS friends as well and has even merged some of the two groups.
Give it a chance. Good luck.