Is it normal that i dread going to places with my family?

Tomorrow, my family is going to a giant mall for one store, and they thought it would be a GREAT idea to bring my whole family. The reason I'm dreading it so much is because my mom is making this a "family fun" kind of thing and I can't stand it. My dad, while I love him, is a complete asshole and is very close-minded. My sister is a snotty spoiled brat (she's 19. I'm 17 for reference.) and her boyfriend is actually a pretty cool guy, he's coming too. My mom, who is always trying to get me to go to church to "lead me down a better life" decided to bring my grandmother, who is not able to walk, into a VERY busy mall in the middle of Atlanta. I didn't even plan on going until yesterday because my mom said "No you're going because we're going to have fun.". This happens every time they all decide to do something out of the blue, and I never have a choice in going because I guess I can't answer for myself. This is why I can't stand being around them because my mom always tries to force the "look at us we're a happy family even though my husband is yelling at my daughter for being a spoiled brat and I swear that I'm super happy.". I hate pretending like something I'm not, and a happy family is a far cry for whatever the fuck we can call us. We're dysfunctional, every one is always yelling at each other, my sister does nothing but wastes my parents money, my mom puts on a charade like we're all happy, my grandma eats up anything the media says, my dad constantly complains about anything and every thing, and then there's me, the one who "acts distant" all the time. We're all completely different people and I can't stand being around all of them at once. So now I ask, is it normal that I would do ANYTHING else then to be with them.