If I you’ve always lived alone and aren’t used to sharing your space or your life with others, it can be hard to understand just how much of a bombshell adding a child to the mix would be. The sw will want to know that you’re flexible in your approach, can cope with the chaos and mess and unpredictability that comes with a child. You may also find your personal space is massively compromised, in my case I had a 4 and 6 year old who literally clung to me 24/7 for years, they still prefer to be physically touching me if we’re in the same room and I can’t remember the last time one of them didn’t come through to my bed at some point in the night.
It’s very hard to accommodate the level of physical closeness some children really need, and if you’re not used to having someone in your space that’s a lot of culture shock to be dealing with. Can you talk through with your sw times when you’ve had to put someone else’s needs first over a protracted period of time, when you’ve had to be very flexible in your approach to life, or when you’ve had to really go with the flow. I’d be looking for personal examples rather than professional ones - as a teacher I’m sure you spent half your professional life bending over backwards, but they’re looking to see how able you are to share your life with someone else.
I think also asexuality is often misunderstood and can be taken by some to mean you’re uncomfortable with physical touch or affection which would be a problem for children who do need physical touch and need you to be able initiate that as well as respond to their approaches. I’d give some thought to how you talk about that aspect of your life, again thinking about where in your life you have physical closeness and how that might translate to parenting children.
I’m usually very critical of the demand from sw around childcare experience but if you don’t have young children in your life or wider social circle, or don’t have experience of providing care to small children I’d probably want to see you gain experience outside of a work setting.
It’s not insurmountable, but you do need to give some thought to what your sw has observed in her assessment and how you can present a different side of yourself to counter that. I’d also ask her what makes her think you need to be in control - her view may be based on assumptions or she may have examples of things you’ve discussed which has given her that impression.