Dude that answer sucks.
Well there's not really any way around it. School is awkward. If you're bad at sports that's fine, don't get embarrassed over it. Sports simply isn't a part of your personality. Not everyone is good at activities, you should just try your hardest since skipping every day isn't an option (its not very cool anyways). Just try to enjoy it, as much as that may seem impossible now. Plus it gives opportunities to get to know your crush!
Gym is actually super fun! I'm pretty sure you're not the only one feeling this anxiety. I was self conscious at first as well. Just forget the rest and focus on what you're doing. I'm sure not everyone in your class is an all-star either. Just try to have fun and get into the games. Once that's established, the confidence will build on its own. You'll do great. Just please don't skip any more classes! It's only going to hurt your self-esteem and academics in the long run.
Don't avoid P.E, you are never marked on your ability. Rather you are marked on how you improve, one day you can do 1 pushup, and now you can do 20 etc.
throw up