I think we all are introverts and extoverts, for examples:
example 1- I like playing computer games and reading alone, but I love playing with big groups!
example 2- I hate people. I usually play alone, but sometimes I play with my sister! I love play with her at garden!
I'm an introvert, because I hate big groups and big parties. I want to play alone! But I'm an extrovert, I love running and playing basketball.
We all are a little introverts! But we all are a little extroverts!
I think we all are 50% introverts and 50% extroverts!
It's my opinion.