NEED ADVICE QUICKLY about swim tom

Christy
Hey everyone so my school is swimming tomorrow for p.e and I'm nervous because first of all I'm really sick and second in not the best swimmer and when I told me teacher this she told me I'm gonna be in level 1 where they teach u to swim but I can swim just not that good. It's gonna be Sooo embarrasing. Everyone in high school can swim they are gonna think I'm a loser. Any advice for tomorrow. I'm freaking out and all my friends are in a higher level so I'm all alone and may even be the only one in the whole class