Songs are about whatever you want them to be about. For me it might mean something completely different than what it means to you. So I'd say it's about whatever the listener thinks it's about.

I'm not a great piano player.

I like barbecuing because it's easy.

Everyone in my high school was a bit nerdy. We didn't even have a football team.

I got stood up by the letter Y, he was hanging around with his X.

All is fair in love and songwriting.

I'm not trying to conquer Hollywood. I love my day job.