>>1 I understand how you feel. I've moved a lot and one of the school I went to was a middle school that had about 4 other elementary schools aside from my own that all went to it.
The best thing for you to do is stay calm, maybe someone you know will be there too, like
>>2 and
>>3 said, things may be better than your middle school year and stressing will make things worse than they actually are. Keep an open mind about the people in your class because a lot of them may feel the same as you. Keep an optimistic view as well. Think to yourself the first day "I am going to have a good day, I will meet new friends, and I will have fun.", it usually helps you be less stressed and if you put all your optimism into it, a lot of the time, the day will be great. Don't stress and think of the absolute worse things because it will change your mindset and people will notice and may not want to approach you. Stay relaxed, calm, and optimistic, don't lose a friendly demeanor either.
I wish you luck and find my advice helpful!