What if you don't love anything or anyone?

I'm not in some rebellious phase or anything. I don't hate anyone or anything. I just feel indifference and I don't even mind that. I'm just wondering whether anyone feels the same. I don't mean romantic love. I mean platonic love, too. I loved one person in my whole live, my sister. But that's over. She's not dead or anything, the feeling's just gone. Can someone here relate to that?