I've been experiencing chronic fatigue for a while. I exercise, sleep 8 hours/night, 28 and living in nyc. How can I start feeling awake again?

Get a workup done. The diagnosis of fatigue is sometimes easy, sometimes elusive. You should see your doctor and have some tests and an exam done. In addition to a complete physical exam, a complete blood count, comprehensive metabolic profile, thyroid tests, and vitamin d level are a good start. Also if you are male checking your testosterone level would be appropriate. Also ask about sleep apnea.