I don't love my half-brother?

When I was 3 my parents divorced, and my mother got full custody. I lived with her most of my life as an only child, and I liked it that way. I never wanted nor asked for another sibling. It was the last thing I ever wanted. When I was about 10 my step mother who I barely knew got pregnant with a baby boy. I went to visit my dad and my step mom for his birth, it was nothing special to me. I only ever visited my dad once in a while and when I did I never really thought much of my little half brother as I was young myself. I'm now sixteen and recently moved in with my dad to gain a better education because of the schools in the location. My father is in the process of a divorce with my soon to be ex step mom, so she doesn't live with us, and my half sibling is only here sometimes. But whenever he is here I just see him as a burden. I can not get past the fact that I do not see him as a brother and don't think I ever will. He is a pest, and i hate that he is even the slightest bit related to me. I just want someone to relate to what I'm feeling, I can't be the only one out there? I feel guilty for almost hating something that sort of shares relation to me, but no matter how hard I try I just can't shake it. I do not love my half brother. why can't anyone understand that and accept it? I did not grow up with him, and we don't even share a full gene pool. So how can i have a connection with him? Does anyone understand what I'm going through?