Feeling Alone and Unimportant

I feel really alone. I don't think anyone really cares about me. I don't feel equal to anyone. my sisters think I'm a kid and I'm 20, they still think I'm a kid and they don't feel like my equal. I have no one who relates to me. I'm loved, but I have no friends. everyone I know is superior to me, my sisters don't see me as their friend they see me as a little kid. and everyone else I know gets paid to work with me. I know it's because I don't have a job and they do and I don't pay rent and they do but that's not something I can change at this exact moment. I'm in a complicated situation. And I feel like no one really cares about me because my sister even said she never takes me seriously. she doesn't care if what she says hurts my feelings or if I'm sad. she doesn't take anything I say seriously. I just don't really want to be alive anymore.