There are several reasons. You may be confused because you don't know whether to study or accumulate social experience. It may be that the relationship with classmates is not harmonious and can not be well integrated into the group; It may be because of dissatisfaction with the school curriculum and activities, and there is a conflict with the school; Maybe the school itself is not the same as I imagined, and it can't adapt well. In short, what we can change is ourselves. We should set goals and work hard through the existing conditions. This is just a hurdle, you will find it when you cross it.