Could My 21 yr old Boyfriend Be Schitzophrenic?

It could be drug use. Steroids? Has he gained weight recently or showed an interest in working out? Cocaine? Does he sniff a lot more? Lol Heroine? Does he have "track" needle marks? It could be schizophrenia. Late adolescence to early adulthood is the most likely onset time for it :/. Either way, he needs help and you need to talk to someone who can help him!