We are ourselves

I think it's about becoming a teenager, but I really don't know.

We are amazing;
No, we are not.

On the inside we dream,
on the outside we rot.

We are what we are,
through and through.

It's happening to me,
it's happening to you.

Why? I really don't know-
It was just meant to be so.

How does it stop? I can not say-
Else I would keep the bad dreams away.

You can't change the world,
And much less yourself.

What am I?
... Well, I am just myself.