I went through it, and it is tricky. My advice would be to look forward to the new experience and be patient. Making new friends is easy for some people and a nightmare for others, just be yourself. My experience of school friends is that once you move on they are gone, find new friends and enjoy them until it is time to move on again, there is plenty of time in later life for more permanent relationships. Enjoy the present. I told my grandchildren who have both just moved school, to think of it like being a potted plant as you grow you need a bigger plantpot and what seemed to be right at first is quickly grown out of.