I sympathise with you so much and I understand exactly where you are coming from. I always saw myself as a mum with a daughter, having sons never really occurred to me.
My first child was a daughter who died at six weeks old. I then went on to have two boys and desperately wanted another girl each time. I tried the so called diets and timing each time and read books on choosing the sex. Obviously to no avail.
As much as I loved and still love and adore my boys it just wasn't the same. I used to get upset going to buy clothes for them and seeing all the pretty dresses and accessories.
Everyone seemed to be having girls as well, friends, neighbours, my sil even acquaintances at school. I can't even put into words how much that upset me - I was in bits every time someone had a daughter.
I didn't want to try for a third in case I had another boy but then my husband was diagnosed with prostate cancer and we decided to just give it one more shot as he would be left infertile after treatment. I fell pregnant immediately and hoped and hoped.
Our third baby was a little girl and she just completed the family. I can't explain it - like completing a jigsaw puzzle everything just clicked. Then a few years down the line we got the shock of our lives when I found out I was pregnant again despite assurances my husband had been left sterile.
This time I really didn't mind what sex I had and the pregnancy was so different to the others I was just more relaxed and easy with everything. Baby number four also turned out to be a girl so we have a perfect balance now.
The funny thing is that if daughter number one had lived I'd probably not have had the desire to have any more children at all. It's funny how life doesn't quite turn out as you expect.
Oh and I do love my boys and they have never been neglected or aware of how much I wanted a girl - it was hard to hide it sometimes but it was my issue not theirs. I am however like a dog with two tails now I have two little girls.
You are not silly or childish or ungrateful - and if you decide to have another child I hope you get your much wanted daughter.
Personally I am a great advocate of allowing sex selection if you already have two the same sex and want the opposite for a balance. I don't think it would affect the population balance if carefully applied. There are lots of mums out there with two girls who would love to have a boy too.