What is a song you loved when you were a kid, belting out the lyrics, but now you know what the lyrics really meant?

Nickel back rockstar, yelling about playboy bunnies and drugs

Beautiful Girl, by Sean Kingston.

I won't even say more, just listen it.

I once shouted “I wanna be sedated!” while singing along to the Ramones song, before I knew what “sedated” meant.

Now I shout it because I have anxiety.

I wouldn't say I ever "loved" the song, but I did like the song Luka by Suzanne Vega and found it quite funny. As an adult I actually listened to the lyrics and realised the song was about child abuse.