Yes Hi I Need Help I Am 18 I Just

Yes hi I need help I am 18 I just moved out of my house my dad has threatened my girlfriends family and has also say I have a mental illness that I must be living with him my whole life and that he gets paid by the government. Which I know is not true because I have been living with for already two months and he hasn't done anything to fight for it but the thing is what I need help is how do I prove that it's not true and bring proof that "I'm not crazy" because her parents are starting to believe him because they believe more adults then me and my father is the crazy one here who kicked me out so can you please help me ur my last hope.