Who Am I?

I spent the night with my family for new years..
Well what used to be my family
I thought I was getting closer to them
The ones I really wish I could say were my second family.
He's like aa brother, and he treats me like a daugter
I used to think we were close
Or atr least closer then before
And then she came along
And I see how close they are
How happy she is
She's got everything I want
The family I won't
She's so pretty
She's skinny
They love her
I just want them to love me
But she hates me
And she told me she won't rest until they know
Until they know what I did, and who I really am
The thing is I don't know..
I don't know what i did
Or who the hell I am anymore
So how can she?