Why do you cry and laugh for a while? I always want to cry at night, because I live in this world.

Want to cry or laugh, it should be emotional instability. Although I don't know what happened in your life, if you are 16 years old, you may have just entered high school, perhaps because you left the familiar environment.

You are not redundant, no one in this world is redundant, and everyone has the meaning that he came to this world. You'll think that's just because you haven't found your meaning.

Finally, I feel like crying at night. How can I put it? At night, people are more emotional and pessimistic. Therefore, I suggest you don't entertain foolish ideas at night and go to bed early.