She may be determined and sure of herself, but she's not an extrovert. A common misconception is that introverts are shy, which isn't necessarily true.

What is an introvert? Because I looked it up and it also said shy.

shy people are introverts, but not every introvert is shy.

Contrary to what most people think, an introvert is not simply a person who is shy. In fact, being shy has little to do with being an introvert! Shyness has an element of apprehension, nervousness and anxiety, and while an introvert may also be shy, introversion itself is not shyness. Basically, an introvert is a person who is energized by being alone and whose energy is drained by being around other people.

Introverts are more concerned with the inner world of the mind. They enjoy thinking, exploring their thoughts and feelings. They often avoid social situations because being around people drains their energy. This is true even if they have good social skills. After being with people for any length of time, such as at a party, they need time alone to "recharge."

I guess that sounds like Tiana.

She mostly keeps to herself

Deffinatley.

I think she is realy extrovert

We learned this yesterday on psychology, she is most certainly introverted