You will never understand

Ive never really understood,
Why you hold me hand,
Why you say you're there for me,
When you never understand,
I don't know why you hold me,
And whisper that everything's okay,
You don't understand who I am,
Or anything I say,
You don't know where my heart is,
Or when there's something wrong,
You don't why I don't sleep,
And stay up crying all night long,
There are so many thing about me,
That I guess you'll never know,
You don't know how hard it is to hold on,
When all I want is to let go.