Because its referring to you. And when you  refer to someone or yourself you capitalize. Its also part of a proper noun.
        
             
        
        
        
Answer:
Anaphora
Explanation:
Anaphora is the repetition of a word or phrase in quick succession. I can see Anaphora in the poem by Jared Singer in the sentence, 
<em>"Record everything they could have told you, </em>
<em>every how could I have let her go away, </em>
<em>every she was the best thing that ever happened to me."</em>
The repetition of the word, Every, is Anaphora.
Jared thus emphasizes what he would have done to assure Sarah that she was loved and protect her from taking her life.
 
        
             
        
        
        
"like a sunbeam" - it is used to give deeper meaning and description to what her face looks like in person so the reader can feel as if they are standing in front of her seeing that face.
        
             
        
        
        
*an adjective is a describing word
d. large