Are posters just ignoring the bit where she says if something happens to her the child would "just have to go into foster care"?!
And when I shared my experience of my mother who used me to meet her own needs as a child (and, like Nags, still does meaning I've never led the full life as an adult that I should have), she said she "didn't know" if she would be like my Mum or not.
I'm sorry, but these are serious red flags.
If you want to meet a child's emotional needs, you would focus on getting the support system in place before bringing to into the world. A child is not disposable. As you say, it's not comparable to a cat and a dog but you seem to have the attitude that , "oh well, if anything
happens to me, she'd just have to go into foster care", like you'd just drop a cat at the rspca.
Do you have any idea the kind of trauma that the child would experience going into the care system?
Nags has made some really important points which you seem dismissive of and on several points you've shown a lack of empathy and you're also not seemingly making efforts to convince posters who raise concerns of your ability to meet the emotional demands of parenthood.
I'm not saying you shouldn't go it alone, but you should seek professional help from someone who can help you process your emotions and expectations of yourself as a parent and of your child. If you want to be a good mum, you'll get help...that's how you'd know you were in a position to put a child first.
I'm sorry, I'm bowing out too and I sincerely hope that if you do go down the donor route soon you do everything you can to put that child first and become a good parent.