Docs, im a 19 year old girl, I exercise 3-4 times a week and eat fairly healthy and sleep well, but my skin isn't glowy, what might be the problem?

Have a medical check. It is hard to know what a glowy skin is like! if you feel well and your blood counts(hemoglobin level) is normal, then i would not worry about your skin looks. If you are not feeling energetic, you should get your CBC done and meet with your doctor and have a physical exam done.