When a parent acts FAKE (who can relate)

Honestly my mom is fake all the time. When she's in front of us she acts like a monster, curses at us or throws stuff at us, then tells us to go kill ourselves. Her pretend nice act in front of people disgusts me most of the time. I mean I love my Mom but she needs to stop being a jerk and as hole towards me and my sister. And stop telling lies to people. Every time she tells me to keep a secret for her I keep it. But when It comes to me, she doesnt. She blab everything like there's no tomorrow and it ticks me off!! Sorry I had to post about this but it needed to get out of my system...