This song to me is about despite how quick time has gone, the person still isn't over their past relationship, no matter how much they try or pretend things are fine, they're not.
They are still considering and thinking about a second chance.
"I'm older than my years"
"Traumatised, I'm so scared to feel"
this in my opinion means the experience of the relationship made them more mature and because of that, they're scared to get close to someone again.
This song to me is about despite how quick time has gone, the person still isn't over their past relationship, no matter how much they try or pretend things are fine, they're not. They are still considering and thinking about a second chance. "I'm older than my years" "Traumatised, I'm so scared to feel" this in my opinion means the experience of the relationship made them more mature and because of that, they're scared to get close to someone again.