I know how you feel hun I felt like that with DD2. It was very different, as I only had one girl at the time, but I understand 100%.
I knew deep down she was a girl, but right to the second she was born & I could see it for myself I hoped she would still be a boy.
You will start to feel better about it & accept it. But I don't think that longing ever goes away. I have DS now & still sometimes think how DD2 should've been a boy. Specially since she's as rough as one, lol.
Thinking of you xx

ETA - I've got loads of boy stuff I was going to sell in a garage sale tomorrow. NB up. PM me your address if you want it