Why is my mom like this?

So, I'll ask a question like where we are going out to eat or where the wood cleaner is and it's met with screaming about how i should already know or just go get dressed. Yesterday my mom thought i shaved a hair off my chin and she screamed at me about how I'll turn inro a dude and be sorry and that hair grows back darker when you shave it. I didn't even shave a hair and she was just yelling like a maniac. I got a One Punch Man t shirt because i like the show and she said "really? This? Dudes wear this not girls." And i said that i like the show and she said "so?". I remember years back when we were doing garden work and i was around 12. It was hot and i was getting dehydrated. I stopped for a second to grab a drink and my dad got so pissed off that he threw a shovel at me. They have rarely ever hit me...Ever. But there were the 2 times when my dad got pissed and threw crap me. I don't get all this screaming and easy anger and belittling over crap like getting a t shirt.