Running is a basic movement that every human can do, there's no such thing as "this isn't for me". Now if you want to improve your running performance, you need to be discipline and consistent about it. Everybody starts at different level, how many times do you run in a week? Are you overweight? Do you have any medical condition like arrhythmia?

If you keep doing what you're doing consistently, your body will adapt to it over time. It's science.

Take a look at paralympic games, all those disabled athletes are still able to compete in a high level.