Who sings Im not a perfect person?

If it goes like this; I'm not a perfect person

There's many things I wish I didn't do

But I continue learning

I never meant to do those things to you

And so I have to say before I go

That I just want you to know

I've found a reason for me

To change who I used to be

A reason to start over new

and the reason is you... then it's The Reason by Hoobastank from the album The Reason