Continuing from my opening warning…
Success is time.
You don’t necessarily see the full extent of this in high school, because people are still maturing biologically. Seeing a 15 year old who is smarter or stronger than a 13 year-old, you get the idea that different levels of ability come from different stages in the development of innate capacities. That’s especially true when you see one 13 year-old who had a growth spurt two years before another 13 year-old and so is the same age, with different abilities. But over the long run, you should think of success in any activity as a question of time invested.
Whatever you want to be good at, you have to spend time on. Conversely, whatever you don’t want to be good at, you can’t spend time on. There are only so many hours in the day, and if you spend them on things you don’t care about you’ll be good at irrelevant things like channel-surfing and bad at important things.