This is something that has bothered me and made me think I might be crazy but I’ve always had trouble missing people. As a child when my parents would go on vacation and leave me with my sibling (they are older and took care of me during those times)  I wouldn’t really miss them or feel the need to call or message them. Same for my siblings , when my sister left the house I didn’t miss her. 
And now I’m in a serious relationship for 2 years and she’s in college but we do get to see eachother everyday but when she goes home on break it feels as if she never really left you know and I don’t necessarily miss her. I’m just wondering if this is normal or asshole behavior 