My brother won't stop talking bad about me to everyone he knows.

I just wanna make this short because I am having a complete mental breakdown at the moment. And also since it's probably important, I am 18 years old.

So I just found out that for the longest time, my brother has been telling his my parents, his girlfriend, and my TWELVE and NINE year old sisters that I am a no good, junkie alcoholic who is nothing but spoiled.

Everything he says is just complete and utter over exaggeration. Yes, I have gotten drunk before and yes I have vaped before. Never was it ever anything serious. I have never been addicted to any kind of substance.

Maybe I'm the one who's getting dramatic but I'm not sure. Am I the only one who thinks it's weird that he's going out of his way to tell my little sisters that I'm something I'm not? I also have no idea why he's doing this because never in my life have I done something to warrant this behavior.

Me and my brother used to be like best friends and we did everything together. But ever since he got a girlfriend (who's a big issue herself), he's been acting like this. In fact, she kind of started everything that happened today, thinking it was in her rights lie to my brother and tell him that I'VE been drinking.

I'm just having the worst day ever, and honestly I'm not even thinking clearly.

Any advice?