Why are they like this?

My mom loves slamming doors, screaming, stomping her feet etc. nothing is ever a calm conversation and its affecting me mentally

I recently found out that my AP’s (mostly my mom) lied to me because a cousin borrowed money from me and it was eventually paid back.

My cousin texted me that she had dropped the money off to my house and my mom handed the “payment” to me. Thanked the cousin for paying so and so.

I recently I found out my parents lied to me and they were in connivance with said cousin to “help” her. SHE DID NOT PAY ME, MY PARENTS PAID ME and covered for her.

When I confronted my mom (cousin is from her side of the family) I calmly asked her “Mom did you really pay in behalf of my cousin?” She suddenly started screaming, yelling, throwing a fit yelling at me and saying “YOU NEVER QUESTION MY AUTHORITY IN THIS HOUSE. YOU ARE NOTHING HERE! I AM THE AUTHORITY AND YOU SHOULD NEVER QUESTION ME!”

I do not understand why you would connive with someone and lie to your child to cover for someone else? I do not understand why (mostly) my mom did this and why they (my dad covered for my mom) are now mad at me for reacting.

I feel fooled and hurt but I’m the bad guy, I’m the one who will “give them a heart attack” when they were the ones who lied to me.

My mom stomps her feet, slams the door when she see’s me even made sure that I was not at the table during lunch…she took away my seat and when I came out to eat later on—there was no food anymore.

She threw away the left over food in the trash. I feel so alone and a friend told me that this anger and tantrums are her defense mechanism because I caught her and she is deflecting it to make me feel bad, doing all this isolation and tantrums towards me to make me never question her ever again….

I’ve been bawling my eyes out trying to understand why a simple question would get me this type of treatment