Scared of a Challenge

I have wanted to break out of my shell and try new things, so I signed up for a month long sleep away camp. I've never been to a sleep away camp alone, and there are 400 other kids attending. I really need to pack, but my heart is beating out of my chest and I can barely type because my hands are shaking. I'm really worried I won't make new friends at the camp. Every time I think of all those kids in the same place I feel light headed. I really want to go, and I know it will be a good experience, but I can't seem to control the anxiety. Any advice?