PE (physical education) is unfair. What do you think?

Im sorry if this sounds rude but my coach always says "your not trying hard enough blah blah blah" all that stuff for the sole purpose of getting better. Listen to this: if you get congratulated you would think your doing great and awsome but my coach says your not doing good so you would think to yourself that i need to do better and better, just think of it like that, but i do agree it could be based on genetics and theres nothing you could do about that. I also agree with the bad grades tho, but not to sound concieted or anything, i am very athletic so i never experienced them but i did realize other people were getting them. Hope this helps,