AITA for not lending my car to my parents for a week so they could go on a vacation?

I have recently bought my first car (used one). It was a big challenge for me as I had to work two jobs for almost a year to save money for it. I've also had to put a lot into the car itself to make it safe to drive. After all that work I'm very happy with my first car, and I take pride in it.<br><br>The problem is that my parents found out about my purchase and now they want to borrow my car for a week so they could go on a vacation. They have a car of their own, but it's a two door and they find my four door more spacious and more comfortable on long rides. I said no to this and my parents are being very pushy about it. I don't feel comfortable with letting them take my car somewhere as they aren't used to it at all and I'm afraid they might damage it. As I said - I've put a lot of work and money into it. They said I'm being selfish and I should let them have their vacation because they deserve one. I said no and they started yelling at me because I wouldn't let them use my car. I don't want my parents to go on a vacation in my car, but they seem to think that it's my obligation. Aita?