Why do people with closed hearts come out and don't like to communicate with others?

To read some psychological books, such as how to be an attractive man, how to control emotions and how to learn to socialize, the best way is to go to libraries and bookstores, where there are many kinds of books. As long as you look for it, you will always find the book you need. If you look patiently, you will find that feeling and understanding. In the process of communicating with friends and family, you will gradually feel your changes. I hope you will have some experience.