I went through something similar in high school and college, my personal theory is that extroversion is very similar in a lot of ways to physical fitness. Some

I went through something similar in high school and college, my personal theory is that extroversion is very similar in a lot of ways to physical fitness. Some people are naturally predisposed to a higher baseline, it's easier for them to maintain muscle mass, etc. However most people can significantly improve their fitness level with dedicated effort. If you are in good physical shape something like going for a short run might be a massive mood/energy boost, but for someone out of shape they will find themselves exhausted very quickly.