I was in my early 40s when I found out I am an introvert, knowledge I really could have used in the four previous decades. Shortly after that I was flattened by a major panic disorder -- most unwelcome news for a busy musician.
Anxiety can make you a prisoner to your own mind. It exhaustively beats your spirit to a pulp. It doesn't go away no matter what you try and how badly you want to change. When decided upon thoughtfully and responsibly, medication can be a lifesaver.