You did not detail what led to your problems at school. I suspect that your failing at school and your latest symptoms might be related. Both are signs of a potential problem. To address your question directly, you need to be evaluated by a mental health professional.
It is unusual to hear voices and to be “checking out.” Hearing voices might be indicative of psychosis. Psychosis is a break from reality. Psychotic breaks can be stopped if caught early. Medication can disrupt psychosis and restore the mind to healthy psychological functioning. The importance of early treatment of psychosis cannot be overstated.
Psychosis is a possibility but so might be a neurological problem. Brain tumors, cysts, drug usage, alcohol withdrawal, and so forth, can cause psychosis-like symptoms.
Your mental health and perhaps your physical health are being compromised. Don’t ignore your symptoms. As you noted, they are greatly interfering with your life. It is imperative that you undergo a psychiatric evaluation as soon as possible. Please take care.