I feel forgetten by everyone?

I am terrible at sports, but my sister isn't. I always have to live up to her, it's like if I'm not good at sports then I'm an embarrassment to everyone, and then I get ignored like I'm trash and I don't matter. And people ask why I don't play, because I'm no good and can't live up to her! I'm always in the shadow of the spotlight, you know? It's horrible, I can't be my own person.