I think I show grief wrong

I'm sorry if this upsets anyone, but I really want to talk about this with someone who might understand. We're putting my dog down today because he has cancer, and my mom is mad at me for not being emotional enough. Since I have autism, I don't cry easily from grief. I still feel it, like that feeling when I can't breathe and like I've swallowed a lead weight, but I just don't get very emotional about it. I'm very pragmatic and logical about grief, but my mom hates it. She says that I can't comfort her because I "don't understand human emotions". I know she said that out of pain, but it's a sentiment that's been echoed before. I've had strangers come to me at funerals to ask why I'm not upset. I think it's legitimately given me a grief complex where I feel terrible about how I naturally mourn. And I feel even worse because I cry really easily at things I consider beautiful or happy, but I can't cry at funerals. So I cry more at happy things than I do with death, and it makes me feel like I've got it backwards somehow. I just really needed to vent about this because it's really upsetting me. I hate being feeling like I'm emotionless.