My immune system is attacking my liver, what causes this? (i am a none drinker of alcohol)

Autoimmune hepatitis: we are not yet aware of the cause of autoimmune hepatitis. It's manifested by autoantibodies against the liver, manufactured by your own immune system. It can be a very aggressive disease, but often is very slow in its onset and its progression. Also, it is treatable, although some of the medicines can have side effects. It is vital that you are treated by a gastroenterologist . Good luck.