is there something wrong with me

I am unable to commit to anything. I cant sympathize with other people (my sister even told me that we don't have the same dad and that her dad left her and our mom when she was young and I didn't feel anything). sometimes I feel numb. I don't like anything. I never feel excited or anxious. I get angry easily but don't show it. I don't like showing affection (like hugging etc.) I like being alone. sometimes I feel like I don't belong or fit in. Is this normal or is there something wrong with me?