What can be done for this 19 year old boy?

it seems mostly as it could be severe depression or more serious symptoms of schizophrenia both of them are mental illnesses, and age of onset ,apathy ,remaining alone go in favor of later although they may b observed in depression also .well does this boy take care of personnel hygiene or not..is he in bothered what is going around him,is he suspicious ,have u seen him talking with himself,smiling with himself,,doing bizarre activities like stripping before other people passing urine at any place,decreased social contact,does he remain in abnormal and physically exhausting postures for a long time without any purpose,if the answer to all this is no it is most likely depression....get him evaluated by psychiatrist as early as possible....note the information is provided to help u decide for better patient care...in no ways is this meant to hurt ur feelings and should not be taking otherwise