There are differences in people's personalities. Some people like to make friends, while others like to be alone. This is a normal expression of their personality. It doesn't mean that there is anything wrong with a person's mind. Just because people don't like it, they make friends widely, that is, they live happily alone, have things they want to pursue, and have no time to take care of many other things.

He is withdrawn, which means that he is more accustomed to himself in his ordinary life. He handles everything by himself, and his life is very independent. He doesn't depend on anyone. After he grows up and works outside, he doesn't even depend on his parents. It's good to call his parents occasionally to report his peace. In most cases, he doesn't have any friends of his own or his opposite sex, that is, himself.

personality is slow-heating, which makes it not easy to make friends. It's not that there is anything wrong with this person's personality, nor that he doesn't want to make friends at all, but that he feels that this matter should follow the attitude of Buddhism. Usually, in most cases, he won't take the initiative to chat with others, so it is naturally impossible to find friends with similar views without chatting with others. Therefore, his life circle is very narrow. Essentially, it's not that he doesn't want to make friends, but that he is a Buddha with such a personality.

Everyone has his own things to pursue. If a person has a firm and persistent heart for a goal urgently, his energy in other aspects will also be reduced. For example, if he wants to study with peace of mind now and make money with peace of mind, then he will not deliberately develop his interpersonal relationship. He feels that his main task at present is to do what he wants most, and there is no extra energy for other fields.