Im always angry and mean and don't know why

See psychiatrist: You need to see a psychiatrist for an appropriate evaluation and diagnosis, as well as a history to see if there is any exposure (such as, say, drug use, or anabolic steroids) that would lead to such behavior.

Psychological: You need to see a psychologist. A teaching called "course in miracles", and which has widespread study groups, explains that there are two basic emotions, love & fear. Your anger emotions derive from an imbalance of these emotions. Join a study group.