I hate my step mom

ok so she screamed at me and my siblings today because apparently our needs are too much money and since my dad was the only one working and my step mom doesn't have a job and I stepped up and held my 10 year old brother and put my headphones on my 13 year old brother while she was screaming even though I was getting tramma reminders I dropped everything to be there for them because my 13 year old brother hates yelling my 10 year old brother is still little and my older sister who is seventeen almost 18 she broke down so I had to be strong for them I also hate crying infort of anyone its rare for me because of what my bio brother did he is 18 but besides that idk what to do I always have to be strong for my siblings