Ughh. Why am I so exhausted and tried all the time if I get enough sleep? Even small activities make me tired.

Many many causes. Possibilities include poor nutrition, sleep apnea, various medical disorders such as anemia, diabetes, or thyroid disorders, psychological factors such as stress and/or depression, and many others. It could even be from overwork or overexercising. While it's easy to provide a list of possibilities, your question can't be answered without more info. See a doctor for a personalized assessment.