Oooh, I love this topic!
I'm an ambivert. Yes, yes, I know - many will argue this trait does not actually exist, but it is the only term I could use to describe myself. I see introversion and extroversion as a sliding scale. They aren't black and white terms to me.
If I'm constantly around other people, I become agitated and stressed. If I'm constantly alone, I become lonely and tearful. You know how there are plants that can survive without water for several months, and then there are other plants that have to be watered twice a day? I'm the plant that can go a week without water. Water me too much or not enough, and I wilt on the spot.
Botanical analogies aside, I tend to mix well with extroverted people. They love me and I love them.

They bring out my more playful and outgoing side, and they don't drain me of my social energy as quickly. Extremely introverted people, however, tend to drain me rather quickly. They also seem to bring out my more quiet and awkward side. I feel that I have to make more of an effort to keep conversation going with extremely introverted people, as opposed to extremely extroverted people. Judging by all the introverted people here, I'm sure this is an unpopular opinion. (I still love you though!!) And I also wanted to add that I don't believe in forcing people to be one way or another. There's nothing wrong with being introverted, and it's not something you can choose. You're either born that way, or you're not. Introverts are really cool - a lot of the most revolutionary people in history have been strong introverts.
I do have introverted friends, and I love them to pieces. My childhood best friend that I still talk to this very day happens to be an introvert, and I adore her. It's just that I can't spend very long talking to them, because I'm so exhausted and snippy afterwards. And because I'm super obsessed with the MBTI, I will say that I have consistently scored INFP in the past but I occasionally get an ENFP result.