The second summer vacation I was very confused. What should I do if I have nothing to do and no motivation every day?

Confusion is normal. In the face of uncertainty, we should find a way to solve it, not let it control! It's good to have a sense of crisis, but you can't put too much pressure on yourself. Try to make a timetable, treat every day as your last, and then proceed according to the plan. I believe you will please this emotion and enrich your heart.