I haven’t cried

My mom passed away in her sleep last Friday. I haven’t cried at all. I feel like I should of cried but idk I’m more relieved then anything which makes me feel like a shitty person. Who’s relived their mom dead ? But like she was sooo depressed. she been through so much in her 79 years. Including our living her son. She was sick and in pain all the time. She went peacefully in her sleep just like she wanted. Idk I feel like I should be a mess like my siblings but I don’t feel anything. Am I’m such a cold person?