Introverts and extroverts

I’ve always thought I was an extrovert and got energized by being around and connecting with people. My husband has always said that he’s an introvert and being around people too much drains him of energy. Now I’m starting to wonder – are there actually introverts and extroverts or is that just a thought we have about ourselves and we could potentially choose to think and experience just the opposite? I.e. I could choose to think that being around people drains me and that thought would make it so?