Is this a sleep disorder? What should I do to keep from sleeping 12 hours every night?

If I’m allowed, I sleep 12-14 hours every night. I’ve done it this past week every single night and it’s really starting to bug me because I have stuff to do. When I’m not permitted to sleep at least 10-11 hours I am very tired throughout the day and HAVE to drink coffee at 3:00 to stay awake. I’m 17 and female.
Is this a sleep disorder? What should I do to be able to sleep less and be energized?

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