Annoyed :/ short rant

I let my family take my car on our family vactation this year. It took me 2 years of saving up to buy this car. it is a second hand car but I love it. It's the only thing that is really mine. Well back to the story. It's only 2 days into the trip and my 14 year old sister has already banged my door against other cars and poles 4 DAMN TIMES. I want to scream. I yelled at her and my mom got pissed and said "it's no big deal. It's old anyway" ughh kill me