I don't think I can have kids

I've recently had some experiences that have made it obvious to me that I am not actually capable of raising a child. I got a cat in October who I absolutely adore, but she's incredibly difficult. She was 5 months when I got her, and she was already very skittish and not socialized. I've done a great job helping her become more confident and better with social interactions with me (and our roommate to an extent), but she will likely always be aggressive with strangers. And she also has a lot of medical issues. She has a pretty painful genetic condition that causes some arthritis-type pain, she has some food allergies/intolerances, and has had two severe sinus infections since I adopted her. Taking care of her would be very different from taking care of a young child, but I do have to deal with some baby-type behavior like her waking me up at night. Sometimes she's woken me up more than 10 times in one night. I help her by feeding her or giving her attention, but I still get very angry when she does this. She also will randomly attack me sometimes when I'm just sitting on the couch minding my own business. It's not super painful, but it is annoying. I can tell that she doesn't really know better and she's just trying to have fun, but I still get very irritated. She can also be very messy and destructive. I can deal with it because it's just a cat, but I would have a much harder time if it was a child. I'm also already tired of explaining why my cat is feral. It's not like people get mad at me or anything, but it's just tiresome. I can imagine it would be much more difficult explaining why my child is feral. If I can barely handle a cat who is like this, I don't think I could handle a child.