Moody/emotional

When are these emotions going to stop. I got pissed off because we are having potatoes again. We live with my mom and brother, she told me "you don't have to mash the potatoes, just boil them". Why do I HAVE to feed these people?! Why do I have to worry about them? They are grown fucking adults. I was buying a bag of donuts and she told me to use my food stamp card, umm... no! I just got cut down on them to $181 a month to feed them, and she wants me to waste money on crap food? Nope, I had cash on me for them. She is irritating me, living with them irritates me, just every thing. All I want to do is cry, but I can't. My son can't see that all the time. Sorry for the rant. P.s. working on moving out asap!