I need help but no one will listen.?

I'm always so depressed and whenever I try to state how I really feel about something, like if I'm okay with something or someone, I always just go with what everyone else thinks of it to make them happy. Whenever I try to tell people how I really feel I get so much criticism for it, I try to tell my mom I'm depressed and she just sighs and tells me to be more positive, I try to tell my dad I don't wanna follow his point of view and he lectures me about everything, and whenever I try to actually help my brother he gives me so much crap and treats me like I'm an idiot. I can't take it anymore. I have no one to talk to about this, no where else I can go I'm stuck and I don't know what to do. I've been thinking about killing myself for the past year and I've been wanting to tell my mom about it but I don't want her to waste her money on buying me pills and psychiatrists and things like that, she's broke enough because of me. But I don't feel like I can live here anymore. There's too much stress and I can't handle it, my mom's getting married soon, my dad might be getting a divorce, and I just cannot take my brothers condescending attitude, and I just turned 18 and now I have to find a full time job within the area so I can start paying for all of my things. I don't know what to do, I just want to get as far away as possible from this place and I have absolutely no way of doing that I just can't take any of this anymore.