I have had diarrhea almost every other day for as long as i can remember. i also feel constantly tired and out of energy. whats wrong with me?

Need evaluation: Could be parasites, celiac sprue, infection, inflammation, tumor, iron deficiency, anemia, other stuff. Need to see your doctor.

Not clear: You need a full evaluation, as there are many possibilities. A colorectal or endoscopic surgeon, or gastrenterologist should be able to help you.

Many things: Chronic diarrhea can lead to dehydration/volume depletion, electrolyte imbalance and porr nutrition all of which can lead to fatigue and lethargy. A thorough workup, identifying the cause and proper treatment once the diagnosis is made can significantly improve or resolve your problem. See a colorectal surgeon or gastroenterologist for a thorough evaluation.