My family is embarrassing. They are ghetto and refuse to see that they need to change! How can I help them change their bad ways?

I want to be part of their lives but they NEVER EVER fail to embarrass me! My father is rude & has little to no manners. My mother is all about gossip & likes to laugh at me. My youngest brother (19) says a lot of bad words and even acts like a wannabe gangbanger & talk like one even though he is not one! My oldest brother (26) smokes a lot of weed & drinks & just acts like he's perfect, he is hardly ever around us & prefers to be out with his friends all the time. He yells at me out of nowhere if he's mad & it doesn't matter who is around, he is a scene maker. My middle brother is just an asshole making mean jokes always & telling me how wrong I am. I really think long & hard before bringing anyone near them bcus I know they won't fail to embarrass me. I feel so bad that we are a broken family & that we don't understand each other. It seems like everyones goal is to just stay away from each other & say negative things about each other. What can I do to help? Can I even help? I have tried but they've only made me cry & they're negativity breaks me! I end up crying all the time so staying away is the more peaceful option although I hate it bcus I can't help but love them so much & want them in my life but should I give up?!?!?