What does this man look like?

Pretty handsome. First of all, you should understand what you want, and then start setting goals and starting to practice. Excellence is a relative concept. If you are better today than yesterday, you will be better today. Therefore, we should have a normal mind about our own changes and not rush for success. Introversion and cheerfulness cannot be achieved at once. You should set some small goals step by step, such as greeting strangers actively, insisting on one thing for an hour without distraction and so on. These anti-shortcomings measures can effectively improve your previous shortcomings and help you gradually develop good study and living habits. Now that you have recognized yourself and your own shortcomings, your direction of becoming excellent is basically clear. With the framework, what you have to do now is to find a solution according to your own shortcomings, suit the remedy to the case, and gradually overcome it. Again, this is a long process. Don't expect to see the results at once, as long as you keep changing, you will become what you want to be in the long run! Come on, I hope I can help you.