How do I even put my shit together?..

I’ve been recovering, training everyday and I can’t help but feel like a failure, all my friends have a brilliant future but I don’t, I have bad grades, I can’t focus, all I can do and that I actually enjoy is exercising but I know it wouldn’t take me anywhere, I’m 17 and I just feel like a failure, I won’t go to college, I just feel stuck, It seems that I got better but I don’t really know if it did.