If your enjoyment of an activity is contingent on being one of the best in the world at it, well, you're not going to have much fun.
Having said that, you'll never know how good you can be at running if you give up on it. But in all likelihood you'd do well if you got to where Sell did and even that is a real long shot.
A child often comes to think that the world sort of revolves around him or her. A big part of maturing is learning that it doesn't and finding a way to be happy anyway. Go to a big road race and run your 30ish 10km. Then wait at the finish line for a while and watch for a while. Really pay attention to the number of people finishing behind you. Many of them feel the same way about you as you do towards Solinsky at al.
Or you can simply decide that you aren't good enough at running as you want to be and give it up.