Before I was 5, I did have a lot of time on my hands. I had no job and really no career, and I spent an awful lot of time listening to records. It was more the classical ones, really - Prokofiev, and I think there was some Mozart in there, and more impressionistic composers like Delius.
When I was a child, I did always feel that people were hiding things, and that they weren't expressing their true feelings. When adults are too complicated, and cover their emotions with layers of well-intentioned subterfuge, the child isn't seeing reality clearly enough and gets upset.
I wrote my first play at the age of 10, 55 years ago, and I've always found it a fantastic relief to imagine I know what things would be like from the point of view of other individuals and to send out signals from where I actually am not. Playwrights never need to write from the place where they are.