Already tired of working?

I'm 16 and I got my first job as a lifeguard at a waterpark. I work full time and we arent open on weekdays so I work 7 hour shifts Saturday and Sunday. When summer rolls around I will only get 2-3 days off per week. Us lifeguards here are also janitors. Long story short, between working and school I get so tired out. I love making money, but I hate waking up and acting like a zombie all day. Even if I go to bed early I am dead tired. Should I still work even though I never get a break?