Is it normal for me to hate being around my mother?

Ok so my mother and I have been very close since I was a little kid. Then my step sister and step brother came in the picture. My father began giving them so much attention and ignoring the rest of us. My mother seems extremely too jealous of the fact that my step siblings have more of his attention so she began snooping around in their business and talking trash about them to ME! Dragging me into that dramatic mess. I've always been the one to have her back for EVERYTHING. From staying in the hospital with her for over 3 days straight when my father refused to, up to the point where I started doing some shit for her. Out of jealously she complains so much and yells EXTREMELY TOO MUCH about any and everything!! It's getting really fucking hard to be around her without just immediately being angry. Her presence now irritates the fuck out of me. She lets her anger out on me and she isn't ever understanding. I can't talk to her about ANYTHING without her yelling at me from the top of her lungs even when it isn't that serious. I can't have a normal relationship with her because I absolutely hate the way she acts. It's getting tiring thinking about how I should feel about all of this.

I love her but I don't at the same time. What do I do? I stil have 2 years until I move out. I honestly don't think I can be around her anymore without going COMPLETELY INSANE. She wants all of my fathers attention so whenever anyone else gets his attention she acts rude and just ugh. Not to mention both of my parents are STRICT. I can't leave the house without them jumping down my fucking throat. I don't really open up to them about anything because they aren't very understanding. My father is a little but my mother is nearly unapproachable whenever I want to have an open conversation about certain things. I just want to have a great relationship with my family without them having to snoop into my business and attempting to ruin every good vibe that I Have. I just don't know how to feel about this anymore. Angry? Sad? Embarrassed? Trapped? At the fact that my childhood isn't how I want it to be. I'm getting sick of all this I NEED ADVICE PLEASE.