Hi Wayliin,
I am an introvert too, so completely understand how you feel. I also find that my introverted-ness can hold me back at times. But being an introvert can definitely be your strength.
It sounds like you want to discover who you are and how your personality can shine through to others so you can lead a successful life. You do not have to change who you are. But you can discover who you are, and let your personality shine through. Once your qualifications are checked, employers select employees based on their personality. That doesn’t mean you have to be an outrageous fake bubbly happy go-get-em giggle fest. You just have to be authentically you.
What is your authentic self? What qualities do you have that other people like? What do your friends say about you? Are you intelligent, thoughtful, fun, easy to get along with, helpful, quick witted, funny, caring, wise etc? and how could these qualities make you a great employee? Are you good at working autonomously, solving problems, thinking on your feet, assisting other employees, a pleasant employee etc?
You don’t have to know what you want to do. I have had several career changes, and even now operate 3 completely unrelated businesses. All you have to do is give something a go that interests you. You are not locked into that for life. If you want to try something else, then you simply move on.
We are all evolving as people. It is ok to evolve your career 🙂