Stressed out?

i am 18 i live with my grandparents right now because i am attending school for esthtics. I will be done by mid february ( hopefullY) well i am supposed to be care free about everything or so so many teens think. well anyways I have all my burdens like my future my boyfriend and some bills along with my grandparnets issues and when i try to go off they hound me about money they make me feel down and depressed about their own issues. I cant take this anymore. My grandma takes xanx and so does my mom. i cant deel with their stress i am trying to not worry about it like everyone says but it is hard when they whine about how they have no money how they walk around huffing and puffing cuz they are pissed off at the bill collectors. also on november my grandfather had open heart triple byp surgery he is obese so they gave him a 10 % chance of surviving through the surgery well he did thank god but that is why i moved from my moms to their home basically to help out with him