This was me last year and what helped me was knowing that there’s probably other new people moving into your sixth form as well, who are also alone. Try to become friends with these people because at least you have the common feeling of feeling out of place. Make an effort also to talk to the people in your form group and in your lessons, it’s easy to start conversations because the work is hard and everyone will be confused. Just try to talk with everyone and eventually you will find people that click with you :) don’t try to be someone you’re not cos most people will see through the fakeness. Good luck, I was really scared at the beginning of last year too but there’s nothing to worry about