I am sorry, OP. You feelings are valid, but please remember this will all change once your baby is born and you meet him and fall in love with him.
That said, I had a strong preference for girls too. I ended up with two daughters, and they are both tomboys, athletic, high energy, loud, adventurous, outdoorsy, good at math…all the cliches we hear about boys. You never know who your boys will end up being when they grow up a bit.
P.s. A friend froze embryos due to AMA a few months after giving birth to her second so and ended up choosing to have a third 4 years later, at 43. She opted for the girl embryo