I feel very useless. It is useless for otaku to go out. I don't know anything. What should I do if people are embarrassed and sad?

Oh, that's all right. I am also an otaku. That's what otaku does. I have our advantages. For example, some of us know computer technology. It's good to be able to save you when you're not at home. After a long time, you will cultivate a quiet and peaceful temperament. Moreover, you can know the world without leaving home!