Why have I felt wierd ever since I was 20?

I remember the year I turned 20, I just feel weak, and tired most if the time, unless I drink coffee, or a monster. Actually, when I was 20 it was mostly just in the mornings. I'm almost 26 now, and I pretty much constantly feel tired, and run down. I dont remember feeling like this at all when I was a teen. I... show more I remember the year I turned 20, I just feel weak, and tired most if the time, unless I drink coffee, or a monster. Actually, when I was 20 it was mostly just in the mornings. I'm almost 26 now, and I pretty much constantly feel tired, and run down. I dont remember feeling like this at all when I was a teen. I had so much energy then. I know people arent as energetic when they get older, but I'm still young. Not that much older than a teenager.
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