I'm tired... just so tired

I know a lot of people work all day everyday. Even longer hours than I do and with kids on top of that. And tbh idk how they do it. I'm 23 with no kids and graduated college almost a year ago and I've been working 40 hours a week every week for almost a year 😞 I'm tired! Ok? I feel so tired every day now! At first I felt young and energized and excited to be out in the field but now after working in such a mentally and physically demanding place I'm exhausted! I want to spend a year with this company then move on soon. But I'm scared that if I move on I'll be at a desk job or something boring. At my job now I get to spend time outside and interacting with the kids. It's fun but it's draining. I don't get a break either. No lunch, no nothing. I do everything when the kids break. So it's hard. Idk what to do. I feel old and broke down...