Unrequitable

This is my first real poem, so any good feedback would be greatly appreciated. Please go easy on me! It's about unrequited love.

I look back

I see her

Many women could be her

But for some reason the only woman I want

Is the one I can't have 

I'm feeling messed up

I'm never enough

But this is still rough

I miss her so much

Without ever feeling her touch

But somehow I feel like she is beside me

I envision her body

With mine and I die

Inside I'm void of life

But I can't cry....