Sorry I saw this question late.
But yea, have fun, try stick with your friends and maybe ask the teacher if you can get a drink, take your time when getting a drink. You could tell the teacher that you want to sit down because you aren't feeling well, because it will get hot from all the sport. Just make sure you do lots of running and look hot, then ask.
Thats some things for next time. But, how was the PE lesson?