Avoid loans at all costs. High school students can't take out a loan and while it keeps going they only get what they can afford at that moment.
Rake some leaves, shovel some snow, or even walk some dogs you name it! Learn to hustle and use the extra money to pay down student loans or save.
Tell me any profession that does that? With more free time in the world to do what they want, high school students live it up. Sports, clubs, activities, friends, you name it.
Granted, it is easier to live freely when you are 16 vs. 26 the carefree attitude is worth adopting. They seem to just have this spirit about them.