I'm going to lie to my parents about my new appartments keys
What is your reason for wanting to lie about that?
I don't want to take the blame when I break something that belongs to them
It's wrong to lie to your parents. They raised you and took care of you for so long that you should trust them.
You're the kind of person who can't keep a secret. I'm not going to tell you anything from now on.
You should do your best to not lie to your parents either way. In addition to that, getting into the routine of lying is a bad habit to have. You may find yourself lying for no reason and eventually people will simply not be able to trust you.