I'm always feeling tired, even when I sleep, I used to have insomnia somtimes I feel depressed in the day for no reason, is this normal?

This is not normal. It is not normal to feel this way. You could be suffering from depresssion, but there are other possibilities. For example, some medical conditions can cause these symtoms. Some medical possibilities might include sleep apnea, thyroid problems, etc. You should see a doctor for evalution.
No. Depression is a set of symptoms related to depletion of a neurotransmitter: serotonin or norepinephrine. They become depleted as the result of chronic external or internal stress. Internal stress is more likely and the best treatment is psychotherapy with or without the addition of the correct antidepressant medication.