No, it isn't, but college/high school has way more opportunities to meet people and friends than in the workplace - you aren't spending 8+ hours at work at thes

No, it isn't, but college/high school has way more opportunities to meet people and friends than in the workplace - you aren't spending 8+ hours at work at these times, there's ample opportunity to meet others (changing classes every year, prebuilt extracurriculars, etc.) These opportunities simply don't exist in the workforce, where it's typically the same group of people in the office. Extroverts like yourself may do just fine but not everyone is like this. The sample size of people you meet who also want to meet other people is exponentially higher in high school/college. Again, the statistics show this. People really struggle with making friends, especially as they get older (when they're working.)