Don't spend money on stupid shit. Work hard.
I spent lots of money but it was on big things. My snowboard gear, trampoline, drumset, cymbals for drum set, computer, shit I needed. Perfectly okay with doing it.
I didn't spend money on shit like candy, overpriced food, drinks from the machine, and all that stuff. The smaller purchases are what kill a lot of people. It's easy to say no to buying something expensive. A lot of people can't avoid those couple bucks here and there that kill you in the end.
The younger you are the easier it is to save. Not sure your age but if you're younger and can't save you need to change that or you're fucked. When you're young you don't have shit to pay for, everything you make is profit, many jobs are under the table. Later in life you have bills like rent, insurance, phone, and all that kind of shit that makes saving a lot more difficult.
Good luck and YOLO