Change me so i can change

I am a childish fiend

It is wrong of me

So it seems

So say so long to me

What I say is always wrong

What others say is always right

Them, you and others

Same old song different light

Am I that bad?

This is mad!

I change 

Doesn't matter

I want to change

I want to be better

But it's out of my range

One final letter