Bad mom

I feel like I'm such a horrible mom. My son turned 9 months old on September 5th. I feel like hes not hitting his milestones and it makes me feel like I'm doing something wrong. I see all these other moms with their babies who are younger or the same age as my little one and they're crawling, pulling themselves up, standing, holding on to furniture and walking around. My son shows no interest in standing, doesnt want to crawl, he just rolls all around the floor and he doesnt want to sit up half the time. I just found out a week ago he needs glasses and has asthma. It just makes me feel like such a terrible parent, that his delays are my fault and maybe he deserves better parent so he can do better in life. Maybe I'm just being over emotional but I really need some support 😞😭