I don't know how to do

I don't know how to do.
I try multiple times, all fail,
I am lost, helps me if you can.
I can not forget her, 
I can not see another lady without seeing her behind
I don't know, maybe she will change her mindset. 
And Say yes even though I know it is quite impossible.
I know it but I am not able to get her out of my heart
I am lost, it's hit my heart.
What should I do?

By Ray Green Washington.