I feel lazy, sometimes i don't feel like getting off the bed, brushing my teeth, showering or going out in public, what could be wrong with me ?

Teen depression: Signs and symptoms that you described include also changes in emotions and behavior. Depression symptoms won't get better on their own. Moreover, they may get worse or lead to other problems if not addressed. Depressed patients may be at risk of suicide, even if signs and symptoms don't appear to be severe. Rec.: see your doctor for future evaluation and referral.

Two possibilities: At your age a common cause of your symptoms is Clinical Depression. An evaluation by a mental health professional may be indicated. Ask your PCP for a referral. Another cause could be a medical issue. Again your PCP should be apprised of your symptoms. A full physical examination might disclose the source of your symptoms.