Quoting MilaaMischief:" You are pretty quick to ask the questions. and i am quick to answer them, because i'm not going into this clueless. I'm not prancing around going BABIES ARE CUTE I WANT ONE. lalala."
I get the impression that you do have the basics together.
But I think one of the reasons these ladies are giving you flack is because in your attempts to prove that you're a competent parent, you're coming across a bit know-it-all ish. I know that the lack of parental approval among everyone else's doubts is discouraging and makes you want to prove the world wrong, but trying to come across like you already have all the answers is having the opposite effect. No one has everything worked out perfectly or has it all together.
They question you to help you to be sure you think of everything, not because they've targeted you to bring you down. Try looking to them for support and advice. Admitting that you may not know it all but are ready to commit to this and be the best parent you can will bring you a lot more support.
Hope I didn't come off rude. Just trying to help. Overall I think you'll do just fine. Good luck OP!