Wanting to Move & siblings

For some 20 somthings out there some of them get to live on their and not have to deal with there sibling but then their are the one that deal with them no matter what. But thre are people like me that still live @ home out of the goodness of there hearts & because they don't want to hear the mom complaining " YOUR LEAVING ME" or " HOW R U GOING 2 SURVIVE WITHOUE ME" tend to feel the guilt of staying home to help out. Well, I'm 22 and able to live on their own but I stay mostly out of fear of leaving my mom home alone cuz she doesn't drive yet & my brother is always in this sour mood to the point that my mom refuses to ask him anything cuz to put is simply he acts like a jackass. Anyway my younger brother who is 18 says he an adult but whenever to treat him like an adult he goes why do i have 2 do that or thats not fair. Every freaking time I say this he " U want to be treated as an adult well that mean having adult responsiblities & acting mature, P.S Life isn't always fair". Sometimes I want to smack him on the head cuz the simplist things go right over his head. He Still thinks I dont know how to take a battery out of his car. Well let him think that cuz he's going to get a real surprise if he gets me angry cuz his car is under my insurance and name.