Why am I so tired all the time?

For the past few months I have felt so drained, mentally and physically. It doesn't make sense because my schedule is actually pretty tame compared to the average person's. I go to college a couple days a week and go to work for a 5 or 7 hour shift a couple days a week. Yet I feel awful like I have a hectic schedule. This is seriously interfering with my daily activities and causing me to neglect certain things. I know none of you are doctors but I'm just looking for some possible reasons why this could be the case.
Why am I so tired all the time?
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