Say farewell to that level, say hello to the new level. Most college kids find out in the first year of university life that their high school coaches didn't help them make the mental/physical transition to harder training. And they find out it's not all fun-and-games. No more ultimate Frisbee for practices and ice cream after tri-meets. It's real work, like being employed (which if you get scholarship, you are employed in a sense).
And they struggle mentally with this because their narcissism comes to the surface because they are not getting articles in the paper about them, no friends/family constantly patting them on the back telling them how awesome they are and to chase their (often unrealistic) dreams (thinking they'll be 'x' fast). And they struggle and want to go back to where they were loved, appreciated, praised, adored, coddled, invested in...and it hinders the cold, necessary realization that if you want to get better, it make take months/years of steady, unrelenting, careful, meticulous, HARD work to move to the next round of PR's/ability to compete at the NCAA level. (But it can be done, and many do it by accepting this.) Their college coach (who knows his/her stuff) becomes cold and distant and a barrier because they won't wipe their a** and paste 'encouraging' posts on their social media shrines to themselves about how dedicated they are because they ran when it was below 40* or when it was above 80* or, gasp, when it was raining! And their college coaches are cruel because they unapologetically suggest that the athletes high school diets and supplemental training was sh*t and they can no longer eat, sleep, and half-a** their way to success because the athletes they are competing against now have also stepped up their game.
Babies want to go back into the crib where it's warm, comfy, low-light, plenteous napping, and all meals are accounted for and everyone is cooing over them like they are the new 'god' of the world. College rookies are sometimes the same. You want to stop feeling alone and insecure at this level? Then realize everyone isn't about you; only you can be about you (only you can really make yourself great). And, stop comparing yourself to others...just set your goals, work hard, and even if you never make All-American, win some Conference title, etc., you'll look back satisfied that you busted your a** and learned lessons that probably 90% of the population never learned: how to endure the real pain, the pain of reaching for something outside yourself with everything inside yourself.