why the hell is life so empty

so uh I'm a 16 year old and I'm really wondering why life is so empty. especially now with the winter break ending where I felt so free and I always had something fun to do. Now I'm back in class, listening to teachers all day long, then going to extra classes and coming home with 1-2 hours left for myself where if I just think about life I just realize it's fucking empty and I feel bad. I also have ADHD and in school It feels crazy not being able to fully focus on anything.My other hobbies like football is fucked this year for me as I have big exams and I have to study a lot for maths and my native language, but at the same time chem, physics and other teachers still put a ton of pressure on us and like plan to fuck our average score.Back to the hobbies, gaming I got strict parents and can't really play a lot, and for side hustles I also can't focus on them because of the studies.

All of this came to me after I went to a party yesterday and felt great but then I woke up to realize that tomorrow I'm back in 5 day cycle of emptiness and school.