Cause teenagers overthink social situations and place too much importance on small shit. Do your best in your teenage years, and reap the rewards when you grow up. No matter how much any of you fail at this point in your life, not much of it will matter. Even out of the friends you make in highschool, there's not many that will stick around later on.

If you fuck up a few times and ruin your reputation. It won't matter. If you end up becoming friends with the popular kids, it won't matter. Half of them will end up working at walmart, and another big portion will end up selling drugs or get hooked. None of this shit matters in the long term. At all. So make the most out of the time you have as a kid.