My boss makes my job so mentally draining 😢 she doesnt take any responsabilities for nothing and im…

My boss makes my job so mentally draining 😢 she doesnt take any responsabilities for nothing and im always the one paying the price.. i always end up doing the work for 2 or 3 ppl.. i have been doing this job for 6years and i have never been treated like this.. now i dont really care in what kind of financial mess i will be in.. but i am defenitly quitting