Student Exchange Programs

I’m not trying to sound like a little kid since I’m going into 10th grade, but for some reason I’m REALLY nervous for starting the new year!! A LOT of my friends won’t be in my classes, I mean I’m an open person and sure I’ll know classmates better but I don’t have classes with a lot of my good friends or I don’t have any classes with them. I don’t want to grow apart from them, but I have a feeling that I will…I’m also nervous for the work. People tell me that 10th grade is harder, so I’m worried I’ll do bad, but people say I’m good at school. And another thing I’m worried about is making friends with the exchange students~~I’m already friends with some of them and I want to be good friends with them, but it was really hard to say goodbye to my “old” ones, I want to have a good experience with them and for them to have a great time in USA,but ughhh! I’ll stay up for a while worrying about it. I don’t know what to do!
Thanks