It seems that everyone has their own friends, good girlfriends and so on. Why do I feel like I didn't? Is there anyone in this world who has no friends?

Everyone has several good friends. To put it bluntly, whether you are a good person or a bad person, he has his own good friends, good girlfriends and so on, because he will eventually find himself the same, the same personality and similar personality. If he thinks he is too self-enclosed without you, he should give himself confidence, communicate with others more and find his friends and girlfriends, so that he can feel happy.