You can’t know everything. So focus on what you need to know, what you’re curious to know, and what will help make your life easier, happier and more productive. Don’t feel pressure to learn things other people know but have little relevance to you. It’s not a competition. There are probably lots of things you know that they don’t, but do you hold it against them? Keep your quest for knowledge focused and selective, rather than cram your mind with useless information.
I realized why I feel so tired, I'm always trying to learn too many things! Too many things that I don't need at all. But why do I learn so many things? I think the reason is I'm afraid I can't catch up with the development of this society.
Oh, it isn't worth doing like this!