You’ll never have this exact energy again. Use some of it on things that might matter in ten years.

Energy at sixteen is a resource that does not come back later. You can stay up, recover fast and learn a skill in weeks that would take a decade later, and most of it currently goes into things that will not exist next year. That is no reason to feel guilty about having fun. It is a reason to point some of the surplus at something with a long shelf life.

Choose one thing with a ten-year payoff and give it two hours a week: an instrument, a language, lifting, writing, a trade skill. Keep the rest for being sixteen. Two hours is small now and enormous added up.