My brother just told me I can't do this.

Today I found out my baby is a boy. When I told my brother, he brought up that our parents didn't do a great job at parenting and that because of my health problems, I will be drained and I'm lucky the baby is healthy because I wouldn't be able to take care of a kid with health issues. He kept telling me how hard this will be and I'm going to be so depleted. Honestly, it rattled me. I'm questioning myself. What if I can't do it? The annoying thing is he doesn't have kids, and everyone in my life who does is super supportive and tells me I'll be great. I know having a kid is a huge deal, I'm 34, married, we are not worried about money but right now I feel terrible.