Why am I always exhausted?

Why am I always exhausted?

I'm 14 years old, I get enough sleep, I eat enough, I am not under or overweight, I am I think 50-52 kg and 163 cm (5'4), I am homeschooled so I'm not as stressed as kids in school, and somehow I'm always tired and have massive dark bags under my eyes. I also have darker likes around my mouth.

Why is this? I feel like sleeping, and I sleep about 10-13 hours every night. Do I have some serious health issue?

Why am I always exhausted?
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