Give me some advice.

Your strength is worthy of recognition, and it is ok to be frugal in your studies. However, you don't have to spend money at home. You can work, but during the holidays, you are still young and have parents around you. However, the most important thing is to concentrate on your study. I believe that your classmates and teachers all say so. If you can't calm down, you can take more classes or find a hobby, which is not bad.