Is it natural to feel tired and listless all the time, even not on your period?

Absolutely not!: You need to be evaluated for an adrenal problem, thyroid problem, anemia, other hormonal imbalances, etc. If you are taking any medications, fatigue may be a side effect as well. You should see a doctor about this. If labs are normal, it doesn't mean you don't have a thyroid or adrenal problem, so seek a holistic physician for further evaluation.