I think it's because your world is bigger and you need to learn more, both in depth and width. You used to think that you won the world by working out a math problem. Now you know that you need to master more skills than specialized courses, or you will be abandoned by the world.
Maybe you only spent time watching two episodes, but in the end you couldn't help watching five or six episodes; Maybe you spent your time reading a book, only to find yourself playing with your mobile phone for half an hour after reading two pages; Maybe you spent all your time sleeping, and the alarm clock originally set at 8 o'clock was finally changed to 1 1 o'clock.
We thought we had a lot of time, but we didn't control them well; We thought that every minute we woke up was busy, but in the end we found that we still didn't learn anything; We always feel good about ourselves and pretend to be diligent, but we didn't expect time to be wasted like this.
In senior three, we had only one choice: study hard, and learn from the dead as long as we can't die. Teachers and parents around you remind you every day: put aside other things and wait until you get into a good university.
It is said that universities are half a society. After going to college, we found that besides studying, we were also busy with various clubs competing for resumes and developing social circles. Faced with all kinds of choices, we often have no time to think about other things and whether it is worthwhile or not. Before calculating, we should consider doing it.