Life should not be like this

Today I saw on Facebook W was made AP this month. To be honest, I envy people like W. She was three years older than me, but she was good at so many things that even giving me another three years, I would not be able to acquire those skills. I think this difference between people is determined by how different everyone spends their every minute: when I have a clear goal in my life, I would be concentrated on it; when I was tired, or I have nothing else to do, I would waster my time rather than spend my time on meaningful things. Just like she could lose weight in her spare time, while I would spend my leisure time watching dramas and eating and eating. 

I don't feel good about myself anymore. I don't feel confident, and I don't feel proud of myself. If I know optimization well, if I know machine learning well, if I knew how to code in python, C++, fortran well, if I am fluent in algorithms, if I can run half-marathon, then maybe I will feel less bad about myself. But why do I have to be good at those things? When I was a kid, hadn't I wanted to be good at something like language, English, piano and paining, skills that every "elegant" girl should be familiar with? How can I stop myself of learning them? Maybe I don't have time to learn them all at one time, I can pick them up one by one. I can study math and those artistic skills at the same time to balance my brain. It takes time, but it is better to do it now than never, right?